explain the role of the mosquito (malaria) and housefly (typhoid) in transmittingcausative agents of disease

Mosquitoes and houseflies play a significant role in transmitting diseases. Here's how:

1. Mosquitoes and Malaria: The female Anopheles mosquito is the primary vector for malaria. When the mosquito bites an infected person, it ingests the malaria parasites present in that person's blood. The parasites then develop and reproduce in the mosquito's gut. When the mosquito bites another person, it injects the parasites into that person's bloodstream, thus transmitting the disease.

2. Houseflies and Typhoid: Houseflies are not direct vectors of typhoid, but they play a role in its transmission. Houseflies often come into contact with fecal matter, which can contain the bacteria that cause typhoid. If the fly then lands on food or surfaces that come into contact with food, it can contaminate them with the bacteria. If a person then consumes the contaminated food, they can contract typhoid.

In both cases, the insects are not affected by the diseases they carry. They simply act as vehicles, carrying the disease-causing organisms from one host to another. This is why controlling the populations of these insects is a key strategy in preventing the spread of these diseases.