What are parasites?

Parasites are organisms that live at the expense of another organism, which we call the host. Parasites feed, reproduce, or gain protection from the host, and in the process can cause harm to the host. There are different types of parasites that can infect humans, animals and plants.

Types of parasites:

1. Unicellular parasites (protozoa): These parasites are microscopic and include species such as Plasmodium (which causes malaria) and Giardia (which causes giardiasis).

2. Worms (helminths): These parasites are multicellular and include various species such as tapeworms, roundworms and flukes. They are larger than protozoa and are often found in the digestive tract, but can also affect other organs.

3. Ectoparasites: These parasites live on the surface of the host’s body. These include lice, fleas, ticks and mites. These parasites can also transmit various diseases.

How are they transmitted?

Parasites can be transmitted in a variety of ways, including through contaminated food and water, through vectors such as mosquitoes or ticks, and through direct contact with infected people or animals.

Symptoms and treatment

Symptoms of parasitic infections can vary depending on the type of parasite, but can include digestive problems, fatigue, weight loss, skin rashes and other problems. Treatment usually includes antiparasitic drugs that kill the parasite or prevent it from reproducing.