Stages of viral infection  Document Sample scope of work
template                                         Lecture 24:
patterns of infection                             BSCI 437 Flint
et al, Chapter 16  General points    • Infection can be
– Acute           – Persistent    • Effects can range from
– Unnoticeable           – Deadly  Viral life cycles    
Cytopathic: rapidly kill the cell while producing a burst of new
particles     Non-cytopathic: infection yields virions without
causing immediate cell death  Incubation period     The time
between the initial infection and the onset of disease symptoms.
 Can range from a few days (cold viruses) to years (HIV)
Stages of viral infection     1. Primary infection- Infection of
cells in the general location where virus enters. Common for
example with cold viruses and Diarrhea causing viruses. Many
viruses including HIV initially infect cells in the infected
area.     2. Viremia- Virus enters the blood system and can be
detected in the blood stream. Not all viruses do this.