Lesson 8e: Opportunistic pathogens

Question 1

this group rarely cause enteric disease in domestic animal, but sometimes involved in localized opportunistic infections in diverse anatomical locations by circumventing host defence mechanism and colonize and survive in affected organs

Answer 1

Opportunistic pathogens

Question 2

produce abundant capsular material which may inhibit phagocytosis and enhance intracellular survival

Answer 2

Klebsiella pneumoniae and Enterobacter species

Question 3

particular importance in those bacteria that colonize the lower urinary tract

Answer 3

adhesins

Question 4

produced by some opportunistic pathogens contribute to bacterial survival when the supply of available iron in tissues is limited

Answer 4

Siderophores

Question 5

induce local and systemic changes which include inflammatory responses, pyrexia, endothelial damage and microthrombosis

Answer 5

endotoxin

Question 6

Diarrhoea; wound infections in some animal species (rare)

Answer 6

Edwardsiella tarda

Question 7

coliform mastitis in cows and sows

Answer 7

Enterobacter aerogenes

Question 8

Coliform mastitis in cows; endometritis in mares; pneumoniae in calves and foals; urinary tract infections in dogs

Answer 8

Klebsiella pneumoniae

Question 9

ear and urinary tract infections in dogs and cats (uncommon)

Answer 9

Morganella morganii subsp. morganii

Question 10

urinary tract infections in dogs and horses; associated with otitis externa in dogs

Answer 10

Proteus mirabilis and P. vulgaris

Question 11

Bovine mastitis (uncommon); septicaemia in chickens (rare)

Answer 11

Serratia marcescens