Biology Questions and Answers
infected person to become immunized
against the disease. Din tropical and subtropicalengue is prevalent regions of
Asia, Africa and South America and it is
transmitted baegypti mosquito, a y the bite of the Aedesdiurnal mosquito. (^)
The viral infection causes varied
symptoms similarmalaise, myalgia ( to flu, like fmuscle pain); inever,
hemorrhagic dengue high fever, with or
without convulsions, amay occur leading to circulatorynd hemorrha failureges (^)
and death. There is no vaccine against
dengue since viruses and it is supposed there are four agentthat the (^)
severity of the disease is gthe patient is already protected areater gainstwhen (^)
one type of virus and is infected by
another. is to eliminate thThe best prophylactice vector mosquito. method
- What is yellow fever?
Yellow foccurs mainly ever is a viral inin Central Africa anfection thatd in (^)
the Amazois prevented through vaccination ann region of South America. Itd
transmitted bmosquitoes of the Aedes genus,y many species of (^)
including Aedes aegypti e Haemogogus.
The infection causes clinicalmanifestations that range from (^)
asymptomatic cases to lethal
fulminating begins with fcases. Generally the diseaseever, chills, malaise,
headache, nausea and evolves to
jaundice (incrafter which the disease ease of bilirubin in blood,is named),
mucosal and internal hemorrhages,
hemorrhagic vomiting and renal failure.
Prevention is done by regular mass
vaccination anto endemic areas. The combat againstd vaccination of travelers
the vector mosquito is also an important
prophylactic measure.
- Why is it difficult to
produce efficient vaccines
against a viral infection like
dengue and AIDS?
It is difficult to make vaccines against
dengue because there are four differenttypes of viruses that cause the disease
(DEN1, DEN2, DEN3 and DEN4) and it is
supposed that the protection one of them aggravates the clinicalagainst
manifestation when the person is later
infected by the another dengue virus.
In the case of HIV, the production of a
vaccine is dhighly mutant anifficult bd evades the antibodyecause the virus is (^)
action.
- Is a viral infection treated
with the same kind of drug
that treats bacterial
infections?
Antibacterial dgreat variety orugs, potent agaif bacteria, are notnst a
effective against viruses, wintracellular parasites. A viral infectionhich are (^)
is difficult to treat since anti-viral drugs
are too specific anefficiency. In general the anti-virald have limited (^)
drugs reduce the viral load (number of
virus) relievinvirals (and anti-retrg symptoms. Tovirals, drugs thathe anti-
act against RNAaction of specific enzymes that virals) often inhibit the
participate in the virus life cycle.
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