Blood borne viruses

Question 1

how does Hep D infect

Answer 1

co - infects with Hep B , must have Hep B first

Question 2

what groups are at greatest risk of blood borne virus infection

Answer 2

IV drug users
sexually active
healthcare workers (sharps injuries)
children from a disease-endemic birthplace

Question 3

what makes a HBV infection chronic

Answer 3

HBsAG persists and no anti-Hbs after 6 months

Question 4

is hep B dna or rna virus

Answer 4

DNA

Question 5

what is the largest and only infectious particle of HBV

Answer 5

dane particle

Question 6

is HCV a DNA or RNA virus

Answer 6

RNA

Question 7

where in the body do both HCV and HBV replicate

Answer 7

liver

Question 8

why is HIV so difficult to make a vaccine for

Answer 8

mutates each time it is transmitted and has developed resistance to anti virals

Question 9

what are the 3 phases of HIV infection

Answer 9

primary infection
prolonged period of latency - no obvious symptoms , around 10 years usually
clinically apparent disease - severe symptoms
end point of disease = AIDS (more than 1 of indicator conditions of HIV present)