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Hoi TM, Satyal P, Huong LT, Hau DV, Binh TD, Duyen DTH, Dai DN, Huy NG, Chinh HV, Hoa VV, Hung NH, Setzer WN. Essential Oils from Vietnamese Asteraceae for Environmentally Friendly Control of Aedes Mosquitoes. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27227961. [PMID: 36432060 PMCID: PMC9699393 DOI: 10.3390/molecules27227961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 10/27/2022] [Accepted: 11/14/2022] [Indexed: 11/19/2022]
Abstract
Mosquitoes, in addition to being a biting nuisance, are vectors of several pathogenic viruses and parasites. As a continuation of our work identifying abundant and/or invasive plant species in Vietnam for use as ecologically friendly pesticidal agents, we obtained the essential oils of Blumea lacera, Blumea sinuata, Emilia sonchifolia, Parthenium hysterophorus, and Sphaeranthus africanus; analyzed the essential oils using gas chromatographic techniques; and screened the essential oils for mosquito larvicidal activity against Aedes aegypti and Aedes albopictus. The most active larvicidal essential oils were B. sinuata, which was rich in thymohydroquinone dimethyl ether (29.4%), (E)-β-caryophyllene (19.7%), α-pinene (8.8%), germacrene D (7.8%), and α-humulene (4.3%), (24-h LC50 23.4 and 29.1 μg/mL) on Ae. aegypti and Ae. albopictus, respectively, and Emilia sonchifolia, dominated by 1-undecene (41.9%) and germacrene D (11.0%), (24-h LC50 30.1 and 29.6 μg/mL) on the two mosquito species. The essential oils of P. hysterophorus and S. africanus were also active against mosquito larvae. Notably, B. sinuata, P. hysterophorus, and S. africanus essential oils were not toxic to the non-target water bug, Diplonychus rusticus. However, E. sonchifolia essential oil showed insecticidal activity (24-h LC50 48.1 μg/mL) on D. rusticus. Based on these results, B. sinuata, P. hysterophorus, and S. africanus essential oils appear promising for further investigations.
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Affiliation(s)
- Tran Minh Hoi
- Department of Plant Resources, Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam
| | | | - Le Thi Huong
- School of Natural Science Education, Vinh University, Vinh City 43000, Vietnam
| | - Dang Viet Hau
- Center for Research and Technology Transfer, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam
| | - Tran Duc Binh
- Department of Plant Resources, Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam
| | - Dang Thi Hong Duyen
- Center for Research and Technology Transfer, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam
| | - Do Ngoc Dai
- Faculty of Agriculture, Forestry and Fishery, Nghe An College of Economics, Vinh City 43000, Vietnam
| | - Ngo Gia Huy
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
| | - Hoang Van Chinh
- Faculty of Natural Sciences, Hong Duc University, Thanh Hoa 440000, Vietnam
| | - Vo Van Hoa
- Department of Pharmacy, Duy Tan University, Da Nang 550000, Vietnam
| | - Nguyen Huy Hung
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
- Department of Pharmacy, Duy Tan University, Da Nang 550000, Vietnam
- Correspondence: (N.H.H.); (W.N.S.)
| | - William N. Setzer
- Aromatic Plant Research Center, Lehi, UT 84043, USA
- Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA
- Correspondence: (N.H.H.); (W.N.S.)
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Essential Oils of Zingiber Species from Vietnam: Chemical Compositions and Biological Activities. PLANTS 2020; 9:plants9101269. [PMID: 32993137 PMCID: PMC7601767 DOI: 10.3390/plants9101269] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/23/2020] [Accepted: 09/25/2020] [Indexed: 11/16/2022]
Abstract
Mosquito-borne diseases are a large problem in Vietnam as elsewhere. Due to environmental concerns regarding the use of synthetic insecticides as well as developing insecticidal resistance, there is a need for environmentally-benign alternative mosquito control agents. In addition, resistance of pathogenic microorganisms to antibiotics is an increasing problem. As part of a program to identify essential oils as alternative larvicidal and antimicrobial agents, the leaf, stem, and rhizome essential oils of several Zingiber species, obtained from wild-growing specimens in northern Vietnam, were acquired by hydrodistillation and investigated using gas chromatography. The mosquito larvicidal activities of the essential oils were assessed against Culex quinquefasciatus, Aedes albopictus, and Ae. aegypti, and for antibacterial activity against a selection of Gram-positive and Gram-negative bacteria, and for activity against Candida albicans. Zingiber essential oils rich in α-pinene and β-pinene showed the best larvicidal activity. Zingiber nudicarpum rhizome essential oil showed excellent antibacterial activity against Enterococcus faecalis, Staphylococcus aureus, and Bacillus cereus, with minimum inhibitory concentrations (MIC) of 2, 8, and 1 μg/mL, respectively. However, the major components, α-pinene and β-pinene, cannot explain the antibacterial activities obtained.
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Lytton SD, Nematollahi G, van Tong H, Xuan Anh C, Hung HV, Hoan NX, Diez G, Schumacher T, Landt O, Melchior W, Fuchs D, Toan NL, Velavan TP, Song LH. Predominant secondary dengue infection among Vietnamese adults mostly without warning signs and severe disease. Int J Infect Dis 2020; 100:316-323. [PMID: 32896661 DOI: 10.1016/j.ijid.2020.08.082] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 08/27/2020] [Accepted: 08/30/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The morbidity in dengue fever is dependent on the dengue virus (DENV) serotypes, the patient age, predisposing immunogenic markers and the frequency of primary and secondary infections. This study aims to distinguish acute primary from secondary dengue infections of Vietnamese adults and to assess the association of viremia and anti-dengue immunoglobulin levels with clinical outcomes. STUDY DESIGN Viral RNA, dengue serotypes and levels of anti-dengue IgM and IgG of hospitalized adult cases were determined in EDTA-plasma samples prospectively collected during three consecutive years of dengue infection in Hanoi. Patients admitted to hospital within 7 days of their 1st reported fever were included. Primary infections were anti-dengue IgG enzyme-linked immunosorbent assay (ELISA) negative on both day of hospital entry (day 0) and day two or three of hospitalization (day 2 or 3) with a positive anti-dengue IgM on either day 0 or day 2 or 3 hospitalization. The secondary infections were anti-dengue IgG ELISA positive on both day 0 and day 2 or 3 with positive anti-dengue IgM ELISA on either day 0 or day 2 or 3. RESULTS The hospitalized dengue fever cases between October 2016 and March 2019 were predominantly secondary infections (74%, 68% and 77%, respectively) with DENV-1 (60% and 65%) and DENV-2 (22% and 26%) serotypes determined in the latter two years. The viremia in primary infection was significantly higher than that in secondary infection (P < 0.01) and positively correlated with the days of hospital stay. In secondary infections, platelet counts were lower than in primary infections (P = 0.04) and IgG levels in secondary infection negatively correlated with platelet counts (Spearman's r = -0.22, P < 0.01). CONCLUSIONS Our results indicate high rates of secondary infection with DENV1 and DENV2 serotypes. Anti-dengue immunoglobulins negatively correlate with hospital stay and platelet counts with few warning signs or severe disease. Further investigations of specific antibodies in adults which predict auto-inflammatory activity after the recovery from dengue infection are warranted.
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Affiliation(s)
| | | | - Hoang van Tong
- Department of Pathophysiology, Vietnam Military Medical University, Hanoi, Viet Nam.
| | | | - Hoang Vu Hung
- 103 Military Hospital, Vietnam Military Medical University, Hanoi, Viet Nam.
| | | | - Gerold Diez
- Institut Virion\Serion GmbH, 97076 Würzburg, Germany.
| | | | - Offert Landt
- TIB MOLBIOL Syntheselabor GmbH D-12103 Berlin Germany.
| | | | - Dietmar Fuchs
- Division of Biological Chemistry, Innsbruck Medical University, Innsbruck, Austria.
| | - Nguyen Linh Toan
- Department of Pathophysiology, Vietnam Military Medical University, Hanoi, Viet Nam.
| | - Thirumalaisamy P Velavan
- Vietnamese-GermanCenter for Medical Research, VG-CARE, Hanoi, Viet Nam; Institute of Tropical Medicine, University of Tübingen, Tübingen, Germany.
| | - Le Huu Song
- 108 Military Central Hospital, Hanoi, Viet Nam; Vietnamese-GermanCenter for Medical Research, VG-CARE, Hanoi, Viet Nam.
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Luo XS, Imai N, Dorigatti I. Quantifying the risk of Zika virus spread in Asia during the 2015-16 epidemic in Latin America and the Caribbean: A modeling study. Travel Med Infect Dis 2020; 33:101562. [PMID: 31996323 PMCID: PMC7049897 DOI: 10.1016/j.tmaid.2020.101562] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 12/21/2019] [Accepted: 01/20/2020] [Indexed: 11/15/2022]
Abstract
Background No large-scale Zika epidemic has been observed to date in Southeast Asia following the 2015-16 Latin American and the Caribbean epidemic. One hypothesis is Southeast Asian populations’ partial immunity to Zika. Method We estimated the two conditions for a Zika outbreak emergence in Southeast Asia: (i) the risk of Zika introduction from Latin America and the Caribbean and, (ii) the risk of autochthonous transmission under varying assumptions on population immunity. We also validated the model used to estimate the risk of introduction by comparing the estimated number of Zika seeds introduced into the United States with case counts reported by the Centers for Disease Control and Prevention (CDC). Results There was good agreement between our estimates and case counts reported by the CDC. We thus applied the model to Southeast Asia and estimated that, on average, 1–10 seeds were introduced into Indonesia, Malaysia, the Philippines, Singapore, Thailand and Vietnam. We also found increasing population immunity levels from 0 to 90% reduced probability of autochthonous transmission by 40% and increasing individual variation in transmission further reduced the outbreak probability. Conclusions Population immunity, combined with heterogeneity in transmission, can explain why no large-scale outbreak was observed in Southeast Asia during the 2015-16 epidemic.
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Affiliation(s)
- Xue Shi Luo
- Imperial College London, St Mary's Campus, Norfolk Place, London, W2 1PG, UK.
| | - Natsuko Imai
- MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, St Mary's Campus, Norfolk Place, London, W2 1PG, UK.
| | - Ilaria Dorigatti
- MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, St Mary's Campus, Norfolk Place, London, W2 1PG, UK.
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Le Hingrat Q, Perrier M, Charpentier C, Jacquot A, Houhou-Fidouh N, Descamps D, Visseaux B. Was Zika introduced to Brazil by participants at the 2013 Beach Soccer World Cup held in Tahiti: A phylogeographical analysis. Travel Med Infect Dis 2019; 32:101512. [PMID: 31704483 DOI: 10.1016/j.tmaid.2019.101512] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 10/31/2019] [Accepted: 11/04/2019] [Indexed: 11/16/2022]
Abstract
BACKGROUND Zika virus (ZIKV) was initially responsible for a limited number of punctual epidemics throughout Africa and Asia. Recently, large epidemics occurred in French Polynesia, Brazil and Pan-America. These outbreaks were associated with severe outcomes such as Guillain-Barré Syndrome and microcephaly of in-utero infected newborns. Previous studies demonstrated that ZIKV was introduced in Brazil from French Polynesia but failed to identify a founding event. METHOD All publicly available ZIKV full-genome sequences (n = 182) were phylogenetically analyzed, using Bayesian method, to estimate the introduction date of ZIKV into Brazil. RESULTS Introduction date into Brazil was estimated between 8th of July 2013 and 4th of November 2013, encompassing the Beach Soccer World Cup held in French Polynesia, in September 2013, which gathered Brazilian athletes and supporters. We also observed that ZIKV sequences from travelers infected in South-East Asia or in Pacific islands were closely related to viruses identified prior to the French Polynesian epidemic, underlining an endemic circulation of ZIKV in those countries since 2007, at least. CONCLUSION This work provides a narrower estimation of ZIKV introduction into Brazil and illustrates the need for a better exploration of ZIKV circulation and endemicity in South-East Asia, while epidemiological and prevention efforts have been mainly focused on the Pan-American epidemic.
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Affiliation(s)
- Quentin Le Hingrat
- Université de Paris, INSERM UMR 1137 IAME, F-75018, Paris, France; Laboratoire de Virologie, AP-HP, Hôpital Bichat-Claude Bernard, F-75018, Paris, France.
| | - Marine Perrier
- Université de Paris, INSERM UMR 1137 IAME, F-75018, Paris, France; Laboratoire de Virologie, AP-HP, Hôpital Bichat-Claude Bernard, F-75018, Paris, France
| | - Charlotte Charpentier
- Université de Paris, INSERM UMR 1137 IAME, F-75018, Paris, France; Laboratoire de Virologie, AP-HP, Hôpital Bichat-Claude Bernard, F-75018, Paris, France
| | - Alaric Jacquot
- Laboratoire de Virologie, AP-HP, Hôpital Bichat-Claude Bernard, F-75018, Paris, France
| | - Nadhira Houhou-Fidouh
- Université de Paris, INSERM UMR 1137 IAME, F-75018, Paris, France; Laboratoire de Virologie, AP-HP, Hôpital Bichat-Claude Bernard, F-75018, Paris, France
| | - Diane Descamps
- Université de Paris, INSERM UMR 1137 IAME, F-75018, Paris, France; Laboratoire de Virologie, AP-HP, Hôpital Bichat-Claude Bernard, F-75018, Paris, France
| | - Benoit Visseaux
- Université de Paris, INSERM UMR 1137 IAME, F-75018, Paris, France; Laboratoire de Virologie, AP-HP, Hôpital Bichat-Claude Bernard, F-75018, Paris, France
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