Pathogen Transmission Matching: Trichomonas to Lice Explained
Trichomonas vaginalis spreads via sexual contact, while Mycobacterium tuberculosis uses aerial droplets—key matches in this MCQ test infection pathways. Correct pairing reveals epidemiology patterns for exams.
Correct Answer
2. A-II, B-IV, C-I, D-III is right. A (Trichomonas vaginalis) matches sexual transmission (II); B (Metacestodes of Echinococcus multilocularis) via trophic (IV); C (Mycobacterium tuberculosis) aerial (I); D (Lice and mites) direct contact (III).
Option Breakdown
Trichomonas vaginalis (A)
Protozoan parasite causing trichomoniasis, transmitted sexually through genital contact without cysts or environmental survival. Not aerial, contact, or trophic.
Metacestodes of Echinococcus multilocularis (B)
Larval stage of fox tapeworm causing alveolar echinococcosis, ingested via contaminated food/water from infected hosts (trophic cycle). Not sexual, aerial, or simple contact.
Mycobacterium tuberculosis (C)
Bacterium behind TB, spreads aerially via respiratory droplets from coughs/sneezes. Not sexual, trophic, or direct skin contact primarily.
Lice and mites (D)
Arthropods like head lice (Pediculus) or scabies mites (Sarcoptes) transmit via direct body contact or fomites. Not aerial, sexual, or trophic.
| Pathogen |
Correct Mode |
Why? |
| A. Trichomonas |
II. Sexual |
Genital fluids |
| B. Echinococcus metacestodes |
IV. Trophic |
Food chain ingestion |
| C. M. tuberculosis |
I. Aerial |
Droplets |
| D. Lice/mites |
III. Direct contact |
Skin-to-skin |
Wrong Options: 1 mismatches A-I (not aerial); 3 swaps C/IV; 4 confuses D-I.
