persistent infections

Question 1

persistent infections occur b/c

Answer 1

adaptive IS cannot clear infection efficiently. virions produced intermittently or continuously for lifespan of person

Question 2

diff btwn chronic and slow/latent infections

Answer 2

chronic can be cleared eventually, slow/latent last for lifetime

Question 3

eg of latent persistent infections

Answer 3

Herpes simple virus. 1st acute infection is followed by period w/out infection. virions produced during periods of activation, w/ or w/o symptomes

Question 4

slow persisent infections

Answer 4

eg HIV. virions produced during initial acute infection. flu like symptoms. may not have symptoms till yrs later. w/ treatment is fatal

Question 5

transforming persistent infection

Answer 5

some viruses can caused infected cells to grown abnormally and change morphology. called transformed. can cause cancer

Question 6

benign tumor

Answer 6

clone of cells that form a localised mass

Question 7

malignant tumor

Answer 7

tumor that infiltrated tissues and causes damage. is cancer

Question 8

metastasis

Answer 8

if cells separate and enter lymph nodes for blood can form secondary tumors called metastasis

Question 9

viruses that cause cancer

Answer 9

hepatitis virus causes liver and cervical cause