Types of Hosts in Parasitology | Microbiology | Host and Parasite | Basic Science Series

Types of Hosts in Parasitology | Microbiology | Host and Parasite | Basic Science Series

1. Definitive Hosts
- Definition: Hosts in which a parasite reaches maturity and reproduces sexually.
- Examples:
- Humans for Plasmodium species (malaria).
- Dogs for Echinococcus granulosus (tapeworm).

2. Intermediate Hosts
- Definition: Hosts in which a parasite undergoes development but does not reach maturity.
- Examples:
- Snails for Schistosoma species.
- Mosquitoes for Plasmodium species.

3. Paratenic (Transport) Hosts
- Definition: Hosts that carry the parasite to another host without undergoing any development.
- Examples:
- Rodents for Toxocara canis (dog roundworm).
- Birds for Alaria species.

4. Reservoir Hosts
- Definition: Hosts that harbor parasites and act as sources of infection for other susceptible hosts.
- Examples:
- Wild mammals for Trypanosoma cruzi (Chagas disease).
- Dogs for Leishmania species (leishmaniasis).

5. Accidental Hosts
- Definition: Hosts in which a parasite is not normally found, leading to atypical or dead-end infections.
- Examples:
- Humans for Toxocara canis (toxocariasis).
- Humans for Echinococcus granulosus (hydatid disease).

6. Aberrant Hosts
- Definition: Hosts in which a parasite infects an unusual location or species, causing severe or atypical symptoms.
- Examples:
- Humans for Echinococcus granulosus (hydatid cysts in brain or bones).
- Humans for Angiostrongylus cantonensis (severe neurological symptoms).

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