Viruses causing hemorrhagic fever are-
Ans. is 'a' i.e., Lassa fever virus Clinical classification of arboviruses . On the basis of usual clinical picture described, three clinical syndromes have been described which can be caused by arboviruses Febrile group (fever and myalgia) - This is the most common group which comprises a large number of undifferentiated fevers, generally begin with or without rashes and joint pain. - Impoant viruses in this group are :- Dengue, Chikungunya, West Nile, Colorado tickfever, Sandfly fever and Sindbis. ii) Encephilitis group - This group affects CNS and causes encephalitis or meningoencephalitis. - Impoant virus in this group are :- California serogroup viruses (California encephalitis, Jamestown canyon, Kesstone, La Cross,Trivittatus), St Louis, JE, central European, Russian spring summer, West Nile, Powassan, Eastern Equine, Western Equine and Venezuela. iii) Hemorrhagic group - Hemorrhagic group is associated with hemorrhage. - Impoant viruses in this group are :- Dengue, KFD, Chikungunya, Yellow fever, Lassa, Crimean HE Congo, Omek, Rift valley, Hanta virus, Marbung or Ebola. . These ( above described) categories are somewhat arbitrary and some arboviruses may be associated with more than one syndrome.eg. Dengue virus can cause all three clinical syndromes.
Lassa fever virus
Yellow fever virus
West Nile virus
All