1276
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Kim JD, Choi IH, Kim SJ. HLA-linked genetic markers in Koreans. Yonsei Med J 1983; 24:127-31. [PMID: 6592884 DOI: 10.3349/ymj.1983.24.2.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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1277
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Mickelson EM, Nisperos B, Layrisse Z, Kim SJ, Thomas ED, Hansen JA. Analysis of the HLA-DRw8 haplotype: recognition by HTC typing of three distinct antigen complexes in Caucasians, Native Americans, and Orientals. Immunogenetics 1983; 17:399-410. [PMID: 6187680 DOI: 10.1007/bf00372458] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We have used seven HLA-D homozygous typing cells (HTC) in a comparative study of the DRw8 antigen complex in three racial groups. Three distinct HLA-D specificities were recognized, each associated with HLA-DRw8. Four of the HTC defined a DRw8-associated HLA-D specificity designated 8.1, one defined a specificity designated 8.2, and two defined a specificity designated 8.3. Each of the three specificities showed an association with a distinct racial group: Dw"8.1" in Caucasians, Dw"8.2" in Pacific Northwest Indians, and Dw"8.3" in Orientals. An informative primed lymphocyte (PLT) cell generated against a Dw"8.1" haplotype was able to distinguish 8.1 from 8.2 and 8.3. Using selected anti-DRw8 sera, a serologic distinction between 8.1 and 8.3 could also be made. It was thus possible, by using both cellular and serologic techniques in a comparative population study, to recognize at least three HLA-D-defined splits of the DRw8 haplotype.
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1278
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Miyakawa A, Kim SJ, Kameyama T, Ishitani R. Butanol extracts from myelin fragments: some characteristics of tryptamine binding. JAPANESE JOURNAL OF PHARMACOLOGY 1982; 32:1051-7. [PMID: 7161961 DOI: 10.1254/jjp.32.1051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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1279
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Kim SJ, Hang HS. [Survey on the teaching-learning of fundamentals of nursing - program for baccalaureate students]. TAEHAN KANHO. THE KOREAN NURSE 1982; 21:37-48. [PMID: 6922304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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1280
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Kim SJ. Difficult cases of trophoblastic disease and its classification and management. Semin Oncol 1982; 9:234-8. [PMID: 6289467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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1281
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1282
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Christiansen FT, Kim SJ, Gosar I, Silver DM, Pollack MS, Dupont B. Alloantibodies reacting exclusively with PHA-activated T lymphocytes. Transplant Proc 1981; 13:1189-92. [PMID: 6973861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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1283
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Kim SJ, Christiansen F, Silver DM, Dupont B. Target determinants in CML identified by cytotoxic effector cells generated against HLA antigens in strong genetic linkage disequilibrium. Transplant Proc 1981; 13:982-7. [PMID: 6168078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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1284
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Christiansen FT, Kim SJ, Silver DM, Dupont B. Cytotoxic effector cells against HLA antigens in strong linkage disequilibrium: identification of a strong, new CML determinant. Hum Immunol 1981; 2:15-29. [PMID: 7275696 DOI: 10.1016/0198-8859(81)90003-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Three sets of cytotoxic effector cells were generated against the A1, B8, DR3 haplotype using haploidentical individuals in three different families. The three sets of effector cells generated against this haplotype showed excellent reproducibility testing, strong cytotoxicity against their specific targets, low autologous kill, and segregation with the sensitizing haplotype within the family. When tested against a panel of cells bearing all combinations of the A1, B8, DR3 antigens, a hierarchy of contribution of the individual HLA antigens as CML target determinants was seen. A new strong target cell determinant was identified by cytotoxicity with one of the effector cells not explicable in terms of the A1, B8, DR3 antigens or known HLA cross-reactivity. A family study demonstrated that this determinant clearly segregates with HLA. The success of this approach in defining new CML determinants may result from the generation of effector cells across a single haplotype in strong linkage disequilibrium or from the presentation of CML determinants in the context of self.
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1285
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Kim SJ, Christiansen FT, Silver DM, Dupont B. Differential behavior of cytotoxic effector cells against HLA antigens in strong genetic linkage disequilibrium. Immunogenetics 1981; 13:297-309. [PMID: 6168580 DOI: 10.1007/bf00364495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Five sets of cytotoxic effector cells were generated, using haplo-identical, first degree relatives in five different families, against the HLA-A3; B7 serological determinants combined with different DR antigens. When tested against a panel of cells bearing combinations of the HLA-A, -B and -DR antigens it was shown that the HLA-B7 antigen was as strong a CML target determinant alone as it was in the presence of HLA-A3. The strength of the HLA-A3 antigen as target determinant varied. With effector cells primed to the HLA-A3; B7; DR2 haplotype, the A3 antigen alone behaved as a weak target determinant. When the same target cells were tested with the effector cells generated against HLA-A3; B7 without DR2, the A3 antigen behaved as a strong target determinant. A number of target cells lacking the serologically detectable HLA determinants present on the sensitizing HLA haplotype were identified as being killed by specific effector cells. These data suggest either a number of new CML target determinants controlled by different loci or the presence of a single, new locus with multiple alleles controlling CML targets.
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1286
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Kim JP, Kim SJ. Clinical studies with cefoperazone in the treatment of bacterial infections in surgical practice. Drugs 1981; 22 Suppl 1:87-93. [PMID: 6456896 DOI: 10.2165/00003495-198100221-00018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Cefoperazone was given to 33 surgical patients who had bacterial infections. A dose of 1 to 2 g bid was administered intravenously for an average of 8.2 days. The overall satisfactory response rate (which includes excellent and good responses) was 79%: 83% in 18 cases of peritonitis and/or intra-abdominal abscesses. 75% in 8 cases of hepatobiliary infections: 100% in 5 cases of skin and soft tissue infections; and 0 in 2 cases of sepsis. The satisfactory response rates according to the isolated organisms were: 11 of 15 Escherichia coli, 15 of 18 streptococci (including 4 of 6 enterococci) 3 of 6 Pseudomonas aeruginosa. 3 of 4 staphylococci 2 of 3 Proteus species, and 3 of 3 Klebsiella pneumoniae. No side effects were observed and there were no abnormal laboratory findings.
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1287
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Kim SJ, Christiansen FT, Gosar I, Silver DM, Pollack MS, Dupont B. Frequency of alloantibodies reacting with PHA-activated T lymphocytes, unexplainable by known HLA activities. Hum Immunol 1980; 1:347-55. [PMID: 6973560 DOI: 10.1016/0198-8859(80)90110-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Two hundred and three sera obtained from multiparous women were screened to determine the frequency of the appearance of antibodies reactive with PHA-activated T lymphocytes, but not with resting B or T cells from the same donor. The panel of cells on which the sera were tested consisted of lymphocytes from 38 unrelated donors known to be homozygous at the HLA-D locus. Forty-two sera were shown to react uniquely with PHA-activated T cells. The reactivities of these sera could not be explained in terms of the defined HLA-A,-B,-C, or DR antigen specificities on the panel cells, nor on the basis of known cross-reactivities among these antigens. Most of the antisera showed strong cytotoxicity with the activated T cells. Such sera may define antigens presented to the maternal immune system during differentiation and development, which are not expressed on adult T cells unless they are activated.
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1288
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Pollack MS, Kapoor N, Sorell M, Kim SJ, Christiansen FT, Silver DM, Dupont B, O'Reilly RJ. DR-positive maternal engrafted T cells in a severe combined immunodeficiency patient without graft-versus-host disease. Transplantation 1980; 30:331-4. [PMID: 6450472 DOI: 10.1097/00007890-198011000-00004] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A 2 1/2-year-old male infant with severe combined immunodeficiency was documented by HLA typing and the presence of a female karyotype in the few spontaneously dividing cells to have an intrauterine-derived maternal lymphocyte graft. The presence of DR antigens on the engrafted maternal E rosette-forming T cells was demonstrated by both cytotoxicity and immunofluorescence techniques using both conventional and monoclonal antihuman DR antisera. These DR antigens were of the same allospecificity, DR4, as the mother's peripheral blood B cells. The patient's B cells and monocytes expressed DR alloantigens DR4 and DR3, corresponding to his genotype. Although fresh maternal lymphocytes react strongly in vitro against patient non-T cells, the engrafted maternal T lymphocytes no longer show this activity. Furthermore, clinical evidence suggesting mild graft-versus-host disease was completely resolved by the end of his first year. The presence of the DR-positive maternal cells may reflect the survival of a group of activated suppressor cells mediating graft tolerance of host tissue.
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1289
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Chaparas ST, Kaufman L, Kim SJ, McLaughlin DW. Characterization of antigens from Aspergillus fumigatus. V. Reactivity in immunodiffusion tests with serums from patients with aspergillosis caused by Aspergillus flavus, A. niger, and A fumigatus. THE AMERICAN REVIEW OF RESPIRATORY DISEASE 1980; 122:647-50. [PMID: 6776857 DOI: 10.1164/arrd.1980.122.4.647] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Antigen-rich mycelial extract (ME) and fractions of Aspergillus fumigatus were compared with culture filtrates of A. fumigatus. A. flavus, and A. niger for their abilities to detect antibody in serums from patients with confirmed aspergillosis caused by these fungi. In double immunodiffusion tests, homologous antigen preparations were more effective than heterologous preparations in detecting precipitins. Mycelial extract of A. fumigatus was more effective than A. fumigatus culture filtrate in detecting antibody in serums from patients with disease caused by A. flavus and A. niger. It did not, however, detect antibody in the serums from approximately half of the patients with heterologous infections.
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1290
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Kim SJ, Chaparas SD. Characterization of antigens from Aspergillus fumigatus. III. Comparison of antigenic relationships of clinically important aspergilli. THE AMERICAN REVIEW OF RESPIRATORY DISEASE 1979; 120:1297-1303. [PMID: 92906 DOI: 10.1164/arrd.1979.120.6.1297] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Antigenic relationships between strains of Aspergillus fumigatus, Aspergillus fumigatus var. elipticus, Aspergillus phialiseptus, Aspergillus flavus, and Aspergillus niger were analyzed by fused rocket immunoelectrophoresis and by skin tests. Seventy-three to 89 % of the numbers of antigens detected between strains and species of the A. fumigatus series were shared. The degree of sharing between antigens of A. flavus, A. fumigatus series, and A. niger was much lower and ranged from 19 to 35 %. In reciprocal skin tests in sensitized guinea pigs, similar relationships were shown. Three fractions of A. fumigatus extract proved to be markedly specific for this species. Cross reactivity was associated primarily with carbohydrate and glycoprotein fractions.
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1291
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Kim SJ, Chaparas SD, Buckley HR. Characterization of antigens from Aspergillus fumigatus. IV. Evaluation of commercial and experimental preparations and fractions in the detection of antibody in aspergillosis. THE AMERICAN REVIEW OF RESPIRATORY DISEASE 1979; 120:1305-11. [PMID: 117731 DOI: 10.1164/arrd.1979.120.6.1305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Commercially available preparations of Aspergillus fumigatus, experimental extracts and fractions of A. fumigatus, and extracts of 5 other aspergilli were evaluated in a blind manner for their abilities to detect antibody in 66 serum specimens from patients with aspergilloma, allergic bronchopulmonary and invasive aspergillosis, and unconfirmed aspergillosis. Rocket immunoelectrophoresis was more sensitive than immunodiffusion in 2 dimensions. Although qualitative differences in antigen composition could be detected, commercial preparations compared favorably with the best experimental extracts in detecting positive specimens. Extracts from young, actively-growing myceliums were most effective and produced the largest numbers of precipitin bands. In contrast to all unfractionated preparations, several fractions of A. fumigatus were devoid of substances that react with C-reactive protein of serums, yet were as effective as the best preparations in detecting serums positive for Aspergillus.
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1292
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Venkataraman K, Bornheimer JF, Pontius S, Kim SJ, Allen JW. Diastolic flutter of aortic valves in aortic regurgitation: a report of seven cases. Angiology 1979; 30:297-303. [PMID: 443598 DOI: 10.1177/000331977903000502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Seven patients with aortic regurgitation, manifesting diastolic flutter of the aortic valve cusps (DFAVC) in the echograms, are described. Five patients with infective endocarditis revealed coarse or fine, irregular DFAVC. Two patients with severe aortic regurgitation and a musical murmur manifested regular DFAVC with a frequency identical to that of a simultaneously recorded diastolic murmur. Of the 5 patients with infective endocarditis, 4 required urgent aortic valve replacement and 1 died. The 2 patients with musical murmurs are clinically stable without surgery. This report extends the clinical spectrum of patients with DFAVC and describes the character of the flutter in patients with muscial murmurs. Furthermore, it suggests that DFAVC is a sign of severe aortic regurgitation.
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1293
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Ishaque M, Kim SJ, Kato L. Oxidation of formate by mycobacteria of the scrofulaceum group. Can J Microbiol 1978; 24:1548-52. [PMID: 747815 DOI: 10.1139/m78-247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Intact cells obtained from Mycobacterium scrofulaceum as well as from mycobacterial strains M.A6 and M.R56 isolated respectively from leprous tissues of armadillo and rat leproma and grown with glycerol as the oxidizable substrate catalyzed complete oxidation of formate. The stoichiometry of formate oxidase system yielded a value of 2 mol of CO2 produced per mole of O2 or per 2 moles of formate consumed. Cell-free preparations from these three strains of mycobacteria contained formate dehydrogenase which was associated exclusively in the particulate fraction. Formate oxidation was markedly stimulated by small amounts of selenite and molybdate added together. Formate-reduced minus oxidized difference spectra disclosed cytochromes of the b type while spectral evidence did not suggest the existence of cytochromes a or c components. The effect of 2-N-heptyl-4-hydroxyquinoline-N-oxide on the redox state of cytochromes indicated that formate oxidation was mediated by cytochrome b with absorption maximum of 556 nm and not of 562 nm.
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1294
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Kim SJ, Spradbrow PB. Administration of a vaccine prepared from the Australian V4 strain of Newcastle disease virus by aerosol and drinking water. Aust Vet J 1978; 54:486-9. [PMID: 743047 DOI: 10.1111/j.1751-0813.1978.tb00296.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
An experimental vaccine containing the avirulent Australian V4 strain of Newcastle disease virus was used to vaccinate 3-or 6-week-old chickens by aerosol and drinking water application. The chickens lacked maternally derived antibody to Newcastle disease virus. When the vaccine virus was diluted in tap water more than 90% of the infectivity was destroyed immediately. The addition of 0.25% skim milk prevented this loss and there was no loss in distilled water. Rates of inactivation at 37 degrees C were similar in tap water and distilled water and were unaffected by the addition of skim milk. Both methods of vaccination resulted in the production of haemagglutination-inhibition antibodies which persisted for at least 8 to 12 weeks. The antibody response to aerosol vaccination was significantly better than that following drinking water vaccination. No clinical disease was induced by exposure to vaccine virus. Serum neutralisation antibodies paralleled those detected by haemagglutination-inhibition in chicks vaccinate once by drinking water. After revaccination through the drinking water, haemagglutination-inhibition antibodies were boosted temporarily while neutralising antibodies were maintained at an enhanced level. From chickens vaccinated by aerosol, Newcastle disease virus was recovered for 10 days from lungs and for 7 days from tracheas and caecal tonsils. Peak viraemia was detected 2 and 3 days after vaccination while both neutralising and haemagglutination-inhibition antibodies became detectable 5 days after vaccination.
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1295
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Kim SJ, Spradbrow PB, Chung YS. The serological response of chickens to Australian lentogenic strains of Newcastle disease virus. Aust Vet J 1978; 54:430-6. [PMID: 743056 DOI: 10.1111/j.1751-0813.1978.tb05570.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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1296
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Kim SJ, Chaparas SD. Characterization of antigens from Aspergillus fumigatus. I. Preparation of antigens from organisms grown in completely synthetic medium. THE AMERICAN REVIEW OF RESPIRATORY DISEASE 1978; 118:547-51. [PMID: 101103 DOI: 10.1164/arrd.1978.118.3.547] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Aspergillus fumigatus was found to grow well in completely synthetic asparagine glycerol medium. Four-day-old mycelia were totally disrupted by vigorous mechanical shaking with 0.45-micrometer glass beads. Such mechanically produced extracts contained at least 52 precipitating antigens. The number of protein and carbohydrate components was maximal in 4-day-old organisms and decreased in older cultures. Conversely, the number of components in culture filtrates increased with longer incubation periods, but was only approximately one-half that produced by the 4-day-old mycelial extracts.
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1297
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Abstract
Problems related to cardiac anatomy and ultrasonic instrumentation affect the accuracy of echographic identification of endocardial echoes. A cadaver model and 13 patients were studied, with direct identification or with the aid of echographic contrast techniques, to identify accurately the endocardial echo. The study showed that (1) echographic contrast agents delineate an endocardial echo in the central portion of the ultransonic beam; (2) a specular reflector exists within the right ventricular cavity; (3) specular reflectors within the septum may give the false appearance of border-forming echoes; (4) septal thickness varies by 1 to 5 mm after the endocardial echo has been identified by the contrast agent; and (5) spurious echoes, related to a wide beam angle, can be confused with the endocardial echo. In light of these problems, three criteria were utilized for endocardial echo identification: the prominent notch in the left septal echo, the specular quality of the right septal echo, and the association of multiple myocardial echoes moving in parallel. With these criteria, the endocardial echoes in 11 of the 13 patients could be accurately identified without the use of a contrast agent. The identification of these problems should provide helpful guidelines in developing more accurate and reproducible criteria for septal thickness measurements.
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1298
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Kato L, Kim SJ, Ishaque M. In vitro cultivation of mycobacteria in cholesterol lecithin media from lepromas of rats infected with Mycobacterium lepraemurium. INTERNATIONAL JOURNAL OF LEPROSY AND OTHER MYCOBACTERIAL DISEASES : OFFICIAL ORGAN OF THE INTERNATIONAL LEPROSY ASSOCIATION 1978; 46:376-85. [PMID: 365791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In vivo grown M. lepraemurium suspensions were inoculated into a basal medium containing cholesterol and lecithin. Slow growing strains of mycobacteria were cultured regularly in these media. The presence of free cholesterol or cholesterol in serum or cholesterol in trypsin-digested egg yolk was essential for growth. The primary cultures were difficult to obtain, but the strains were easily subcultured. A heavy inoculum was necessary to obtain primary cultures in the liquid media, no growth occurred on semisolid agar slants. Similarly slow-growing primary cultures were obtained on Ogawa egg yolk media. Growth developed in a considerably shorter time if Ogawa's medium was enriched with 0.4% yeast extract (Difco). The cultures obtained on Ogawa egg yolk media were successfully subcultered in liquid cholesterol-lecithin media. The relation of the cultured strains of mycobacteria to the pathology of murine leprosy is not yet clear. The dynamics of cholesterol metabolism in the macrophages related to murine leprosy is discussed.
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1299
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Abstract
Five patients with muscial murmurs were studied noninvasively with simultaneous echocardiography and phonocardiograpy and phonocardiography. Three patients had aortic regurgitation, one mitral regurgitation and one tricuspid regurgitation. The frequency of the muscial murmurs ranged from 40 to 158 cycles/sec. The patient with tricuspid regurgitation manifested an inspiratory honk. Simultaneous echo-phonocardiography revealed regular valve leaflet flutter (aortic, mitral or tricuspid) at a frequency identical to that of the simultaneously recorded muscial murmur. This study demonstrates that echocardiography is a useful noninvasive tool in identifying the site of origin of musical murmurs.
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1300
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Kim SJ, Spradbrow PB, MacKenzie M. The isolation of lentogenic strains of Newcastle disease virus in Australia. Aust Vet J 1978; 54:183-7. [PMID: 687276 DOI: 10.1111/j.1751-0813.1978.tb02446.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Twelve isolations of Newcastle disease virus were made from 77 clinical samples from chickens from conjunctivitis, respiratory disease, proventriculitis and bursal atrophy. Nine of the isolations were made from chickens with conjunctivitis. The viruses were identified as Newcastle disease virus by inhibition of their haemagglutinins with specific antiserum to Newcastle disease virus. The viruses failed to kill chicken embryos after inoculation into the allantoic cavity and they were judged to be lentogenic strains. There was no evidence that the Newcastle disease viruses were responsible for any of the clinical conditions from which they were isolated. The presence of other agents in 10 of the samples was indicated by reduced production of haemagglutinin in allantoic fluids of infected embryos, by deaths of infected embryos, by the production of cytopathic changes in avian cell cultures and by electron microscopy. Three isolations of infectious bronchitis virus, 2 of avian adenovirus and one of avian reovirus were made. Other samples were suspected of containing infectious bronchitis virus and mycoplasmas, but these were not isolated. The Newcastle disease viruses failed to produce plaques in chicken embryo fibroblast cell cultures and they were separated from the contaminating agents by haemagglutination and elution followed by passage at terminal dilution in chick embryos. No Newcastle disease virus was isolated from 60 caecal tonsils and 60 lung samples from 9-week-old broiler chickens. Eight lung samples yielded mycoplasmas that caused haemadsorption in chicken cell cultures. The mycoplasmas were probably Mycoplasma gallisepticum.
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