Question

In mice, the LD50 for staphylococcal enterotoxin is 1350 ng/kg, and the LD50 for Shiga toxin is 250 ng/kg.Which of the following statements is true?

a) More organisms of Staphylococcal bacteria must be ingested to cause infection, as compared to Shigella bacteria.
b) Staphylococcal enterotoxin is the more lethal of the two toxins.
c) Shiga toxin is more lethal than staphylococcal enterotoxin.
d) The parenteral route is the preferred portal entry for Shigella bacteria.

Answer 1

Option C

Step-by-step explanation:

Staphylococcal enterotoxin B (SEB) is a toxin produced by gram positive bacteria named as Staphylococcus aureus. It causes food poisoning and is a super antigen. It is toxic if inhaled or ingested and its symptoms occur within a period of 3 to 12 hours

Shiga toxin is produced by bacteria Shigella and some strains of E. coli. It leads to kidney failure. It is so lethal that till today there is no treatment for infection caused by this toxin. It kills nearly 160 million people every year.

Hence, shiga toxin is more toxic and deadly than the Staphylococcal enterotoxin

Option C is correct