Question

Name the causal agents for the following viral diseases:

(i) common cold (ii) yellow fever (iii) rabies. ​

Answer 1

1. Common cold, acute viral infection that starts in the upper respiratory tract, sometimes spreads to the lower respiratory structures, and may cause secondary infections in the eyes or middle ears. More than 200 agents can cause symptoms of the common cold, including parainfluenza, influenza, respiratory syncytial viruses, and reoviruses. Rhinoviruses, however, are the most frequent cause, and some 100 different strains of rhinoviruses have been associated with coldlike illness in humans.

2.The Disease: Transmission, Reservoirs and Etiologic Agent

Yellow Fever is a hemorrhagic fever transmitted by mosquito bites. Humans and monkeys are the primary animal reservoirs, whereas the mosquitoes are the primary vectors for this virus. The etiologic agent of the Yellow Fever virus is a single-stranded, RNA-enveloped virus of the genus Flavivirus and family.

3.Rabies lyssavirus, formerly Rabies virus, is a neurotropic virus that causes rabies in humans and animals. Rabies transmission can occur through the saliva of animals and less commonly through contact with human saliva. Rabies lyssavirus, like many rhabdoviruses, has an extremely wide host range. In the wild it has been found infecting many mammalian species, while in the laboratory it has been found that birds can be infected, as well as cell cultures from mammals, birds, reptiles and insects.

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Answer 2

1) rhinoviruses

2) etiologic virus

3) rabies virus or monkey