CORRELATION OF PRODUCTION OF INFECTIOUS VIRUS WITH SEQUENTIAL STAGES OF CYTOLOGIC ALTERATION IN HELA CELLS INFECTED WITH ADENOVIRUSES TYPES 5 AND 7

Physicochemical properties and cytopathogenicity of an adenovirus-like agent isolated from corn snake (Elaphe guttata)

A virus isolated from the internal organs of a moribund corn snake (Elaphe guttata) replicated in reptilian cell cultures (IgH-2, TH-1 cells) between 10 and 30 degrees C. Highest infectivity titers of 10(5.5) TCID50/ml were obtained in IgH-2 cells at 25 degrees C. Infected IgH-2 cells showed the development of three morphologically different intranuclear inclusion bodies. During viral assembly the particles formed typical crystalline aggregates in the nucleus. About 64 h after infection progressive desintegration of the nuclear membrane was evident and virus particles were released into the cytoplasm. Different fish cell lines (CLC, CHSE-214, BF-2, PG, RTG-2) were not capable of propagating the virus. The DNA containing agent proved to be stable at pH3, more or less at pH 12 and to treatment with chloroform, but it was rapidly inactivated at 56 degrees C. Electron microscopy revealed nonenveloped icosahedral particles with a diameter of 65-70 nm.

Antibodies against adeno-, cytomegalo and rubella viruses in Australia-antigen-negative sera from patients with infectious hepatitis

Antibodies neutralizing adenovirus type 5 were found in all of 50 pairs (100%) of sera from patients with acute icteric infectious hepatitis. The incidence in sera from the general population was 57%. No differences in mean titre or in proportion of positive sera were found in the same sera tested for complement-fixing antibodies to cytomegalovirus and for antibodies to rubella virus haemagglutinin. The results can be interpreted as supporting the involvement, either direct or indirect, of adenovirus in the aetiology of infectious hepatitis; but could also be due to a non-specific anamnestic enhancement of the production of antibody to adenovirus, or to coincidental infection with adenovirus and the agent of infectious hepatitis.

Histopathology of fatal adenovirus infection of the respiratory tract in young children

Type 7 adenoviruses were isolated from lung tissue obtained at the necropsies on five children aged 8 to 15 months. The clinical and radiological findings were those of bronchiolitis and pneumonia. Four children had an extensive necrotizing bronchitis and bronchiolitis. The surviving bronchial epithelium, and all bronchial epithelium in the fifth case, was proliferating. There was evidence that this proliferation was a virus-induced effect and not reparative. There was virus tropism to alveolar lining cells with a pneumonia showing mononuclear cellular reaction, necrosis, and hyaline membranes. Distinctive necrotizing lesions were found in the bronchial glands of all cases. Two contrasting types of intranuclear inclusions were present in all lesions and their significance and inter-relationships are discussed. These pathological changes are specific for infections by a limited number of adenovirus serotypes.