group 9

Question 1

rickettsias and chlamydias

Answer 1

both though distantly related taxonomically, are placed together in this group because both are obligate intracellular parasites, unable to reproduce on their own and must infect an appropriate host cell in order to do so

Question 2

Rickettsias

Answer 2

are transmitted to humans via the bites if ticks (rocky mountain spotted fever) or fleas (typhus)

Question 3

Chlamydias

Answer 3

are transmitted to humans by direct contact or airborne contact. Chlamydia causes nongonocoocal urethritis, which may be the most common STD in the US. Children born to infected mothers may suffer eye infections (trachoma), which can lead to blindness if untreated (so, silver nitrate or antibiotic salve is applied to newborn’s eyes).