Question

Chain of infection in yellow fever can you please give me clear answer . I appreciate your help at least 200 words or more.

Answer 1

Yellow fever is a form of acute viral haemorrhagic infection spread by a particular species of mosquito.The virus is mainly transmitted through the bite of infected mosquito in the Aedes species and it can also act as a vector for this virus.The onset of symptoms of yellow fever is sudden and the severity is range from mild to even fatal.

It may ranges from :

*sudden onset of fever with severe headache

*mostly during the 3^rd day jaundice may appear that indicates poor diagnosis

*In severe case there may be hematemesis,renal failure,renal failure,delerium,coma,and even death

The chain of infection means the way which the pathogens or the infectious agent that can be transmitted from one to another.By knowing the chain of infection or the disease spread we can break the chain and thus prevent the epidemics of disease.

Here we can see the chain of infection of yellow fever as:

Infectious agent $\small \rightarrow$ Reservoir $\small \rightarrow$ Portal of exit $\small \rightarrow$ Mode of transmission $\small \rightarrow$ Portal of entry $\small \rightarrow$ susceptible host

Again this will be be going on till break the chain (the pathogens can be transmitted from person to person via the bites by infected mosquitoes)

Yellow Fever Virus (Infectious agent) $\small \rightarrow$ The virus circulates between the human host or the reservoir (Reservoir) $\small \rightarrow$ Mosquito acquired the virus when they feed on a viremia host,after that the virus may infect many tissues of the mosquito,including the salivary glands.While it take can a matter of weeks to become infective,there after the mosquito are capable of infected for life (Portalof Exit) $\small \rightarrow$ The only mode of transmission is bites by infected mosquitoes (Modes/Means of transmission) $\small \rightarrow$ New infections in humans can occur when the mosquito saliva that contains the virus is infected in to a non-immune host during the subsequent meals/ infected mosquito bite ( Portal of Entry) $\small \rightarrow$ Non-immune host or unvaccinated person or unvaccinated tourist (Susceptible Host)