Talk to us?

NEET MDS Quiz - Practice Test
Notes Subscribe 👤 Welcome User

📚 Menu

👤 Welcome User

Score: 0/3
📝 Notes ⭐ Subscribe

📚 Select Subject

📚 Subjects

Practice Test

General Microbiology - 3 Questions

1
General Microbiology

Which of the following is the correct Lancefield group for Streptococcus pyogenes?
1) A
2) B
3) C
4) D

📝 Explanation:

Streptococcus pyogenes is classified as Lancefield group A.

2
General Microbiology

What is the name of the live oral vaccine for typhoid fever and what is its mechanism of action?

1) Typhoral, a Gal E mutant of S. typhi that "self-destructs" after a few cell divisions

2) CholeraVax, a killed whole-cell vaccine

3) Salmonellosis vaccine, a live attenuated strain of S. paratyphi

4) Shigellosis vaccine, a bacteriophage preparation

📝 Explanation:

the live oral vaccine for typhoid fever is Typhoralx, which is a Gal E mutant of S. typhi. The mechanism of action involves the attenuated bacteria colonizing the intestinal mucosa and inducing an immune response that protects against subsequent infection with the pathogenic strain.

3
General Microbiology

What is the mechanism by which toxoid vaccines confer immunity?
1) By stimulating the production of neutralizing antibodies against bacterial toxins
2) By inhibiting bacterial adhesion to host tissues
3) By preventing biofilm formation
4) By inducing the production of memory T cells

📝 Explanation:

Toxoid vaccines contain chemically inactivated bacterial toxins that retain their antigenicity but lack toxicity. They stimulate the production of neutralizing antibodies (antitoxins), which protect against the harmful effects of bacterial toxins.

🎉 Quiz Completed!

0
out of 3
0%