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Antimicrobial Chemotherapeutic Agents Questions and Answers

1.

Name the drug molecule recommended for the treatment of H1N1 flu :

Exam Year(s)

MH SET - 2018, SET Exam - 2018,

Answer: B

The recommended drug for H1N1 influenza is oseltamivir.

Oseltamivir (Tamiflu) is a neuraminidase inhibitor. The viral neuraminidase cuts sialic acid so that new virus particles can leave the infected cell; blocking it traps the virions on the cell surface and limits spread. It was the main drug used in the 2009 H1N1 pandemic and is recommended in India's guidelines for treating and preventing swine flu.

Amantadine (spelt Amantidine) blocks the M2 ion channel, but the pandemic H1N1 strain is resistant to it, so it is not recommended. Paracetamol and aspirin only relieve fever and aches, and aspirin is avoided in children with influenza because of the risk of Reye's syndrome.

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2.

Match the antibiotics in Column A with their appropriate antimicrobial activity from Column B :

Column AColumn B
I. Gatifloxacin(a) Antifungal agent
II. Acyclovir(b) Antibacterial agent
III. Mefloquine(c) Antiviral agent
IV. Griseofulvin(d) Antiprotozoal agent

Exam Year(s)

MH SET - 2023, SET Exam - 2023,

Answer: B

The correct matching is I-(b), II-(c), III-(d), IV-(a).

  • Gatifloxacin is a fluoroquinolone that inhibits bacterial DNA gyrase and topoisomerase IV: antibacterial.
  • Acyclovir is a guanosine analogue that inhibits herpesvirus DNA polymerase: antiviral.
  • Mefloquine is used to prevent and treat malaria, caused by the protozoan Plasmodium: antiprotozoal.
  • Griseofulvin is taken orally against dermatophyte (ringworm) infections: antifungal.

The other codes go wrong on at least one drug: one makes acyclovir antifungal, one makes gatifloxacin antiprotozoal, and one swaps acyclovir and mefloquine.

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