These infections can usually be avoided by thoroughly cooking fish and seafood.
Toxoplasma
According to the CDC, millions of people around the world carry the Toxoplasma gondii parasite. However, only a few of us suffer any symptoms, due to a robust immune system. That said, there are people who develop texeoplasmosis and may suffer a severe infection.
The symptoms, like those of the flu, might be weakness, fever, muscle pain and enlarged lymph nodes.
Like the ones before, the risk groups are pregnant women and people with a weak immune system. The paracite can cause more severe diseases though, which may harm the brain, eyes, liver and lungs.
The toxoplasma gondii bacteria is found in a large variety of animals, but it can only breed in the stomach of a cat. That is why cats are considered the main spreaders. Cats usually catch the parasite by eating raw meat, unwashed vegetables or by contact with other cat feces which contain the eggs of the parasite.
To prevent infection, the CDC recommends cooking your food safely and avoiding low heats, wash your hands while handeling raw food, and to avoid unclean water and cat feces.
Salmonella
Salmonella is a group of bacteria usually found in uncooked poultry, eggs, beef and sometimes unwashed fruit and vegetables. Touching food or animals that came in contact with the bacteria might cause an inflammation in your digestive system. This inflammation is called salmonellosis and its symptoms include fever, diarrhea, stomach and head aches which can last between 4 and 7 days.
Most people heal without treatment, but for the elderly, babies and people with chronic diseases, Salmonellosis can spread in the blood, with deadly results.
To avoid infection, avoid eating uncooked eggs, meat and poultry not fully cooked, and keep your raw meat separate from the cooked meat. Also wash everything that came into contact with uncooked foods.

Norovirus
This virus can do harm to the stomach and bowels, and is often called 'stomach flu'. The bacteria are usually found in contaminated food or beverages, but can also be passed by touching surfaces or other people carrying it.
The virus can cause an inflammation in the bowels (gastritis). The symptoms include Fatigue, headaches, nausea, stomach pain, vomiting, diarrhea and fever that tend to last a few days. Most people overcome the disease, but it's important to drink enough fluids to replace what you lost.
To avoid infection, always clean your hands with soap after handling foods, and disinfect work surfaces in the kitchen and restroom.