Biomedical subjects

V Dhanda

Publications and source records attributed to V Dhanda.

At least 37 records · Page 2Linked to original sources

PubMed1990

Survey of ticks (Acarina: Ixodidae) for Crimean haemorrhagic fever virus activity in Jammu & Kashmir state, India.

A survey of ixodid ticks was carried on in 1977 to determine the crimean haemorrhagic fever (CHF) virus activity in Jammu & Kashmir state, India. In all, 412 immatures and 3258 adults belonging to 7 genera and 16 species of ticks were collected as ectoparasites of small and large mammals. These included one species each of the genera Boophilus, Dermacentor and Nosomma, 2 species of Rhipicephalus, 3 species of Ixodes and 4 species each of Haemaphysalis and Hyalomma. Haem. bispinosa was the predominant species followed by B. microplus, Haem. montgomeryi, R. haemaphysaloides and Hyal. m. isaaci. The four Hyalomma species viz., Hyal. a. anatolicum (incriminated as the vector of CHF virus), Hyal. detritum, Hyal. dromedarii and Hyal. m. isaaci were found parasitizing goat, sheep, camel and cattle and were collected in the districts of Jammu, Rajouri, Poonch and Udhampur. Four species viz., Haem. intermedia, Hyal. detritum, Hyal. dromedarii and Hyal. m. isaaci are new records for the state. A total of 138 pools comprising eight species under six genera of ticks were processed for isolating the virus. CHF virus was not isolated. The role of ixodid ticks, particularly those of the genus Hyalomma in the dissemination of CHF virus is highlighted.

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PubMed1990

Isolation of Japanese encephalitis virus from Culex pseudovishnui Colless, 1957 (Diptera: Culicidae) in Goa.

A strain of Japanese encephalitis virus was isolated from a pool of 54 female C. pseudovishnui Colless, 1957. The mosquitoes were collected in August 1988 during the period of epidemic of JE. This is the first report of isolation of JE virus from mosquitoes in Goa in the western coastal belt of peninsular India. In view of this isolation, C. pseudovishnui acquires greater importance, even though its density and relative prevalence during the current study was found to be far lower than C. tritaeniorhynchus.

Animals↗

PubMed1989

Japanese encephalitis virus infection in mosquitoes reared from field-collected immatures and in wild-caught males.

Immature stages of mosquitoes collected in JE endemic areas of Karnataka, India between 1985 and 1987 were reared to adults and processed for the detection and isolation of Japanese encephalitis (JE) virus in an attempt to find naturally occurring vertical transmission of the virus. Males collected during 1985-1986 were also processed. A total of 15,785 adults reared from immatures and divided into 445 pools and 1,756 wild-collected males divided into 128 pools were processed using mosquito inoculation and immunofluorescence techniques. JE virus antigen was detected in 9 pools, 4 of which yielded JE virus. These were 2 pools of males and 1 pool of female Culex tritaeniorhynchus and 1 pool of male C. pseudovishnui, suggesting vertical transmission of JE virus in the mosquitoes.

Animals↗

PubMed1988

Absence of viraemia in cattle after experimental infection with Japanese encephalitis virus.

Cow calves were infected with Japanese encephalitis virus (JEV) by parenteral inoculation. One batch was reinfected with JEV, followed by West Nile virus (WNV), while another batch was reinfected directly with WNV. No viraemia due to either JEV or WNV was demonstrated in any of the calves. Culex tritaeniorhynchus mosquitoes fed on 4 of the calves infected with JEV during the first 10 d had no detectable virus, nor did they transmit the virus by bite to susceptible baby chickens. In another experiment, calves did not develop viraemia after infected C. tritaeniorhynchus mosquitoes were allowed to feed on them. Neutralizing and/or haemagglutination-inhibiting antibodies against JEV were demonstrated in 6 of the 11 calves, which explains the high proportion of JE seropositives among cattle in India. All the 5 calves that were infected with WNV subsequent to JEV developed neutralizing and haemagglutination-inhibiting antibodies against WNV also. The study indicates that cattle do not play a role in the maintenance of JEV in nature.

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PubMed1985