B50-B64: Protozoal diseases

Protozoal diseases, as classified under codes B50-B64 in the ICD-10 WHO 2016 classification, refer to a group of illnesses caused by microscopic, single-celled organisms called protozoa. These diseases can be contracted in various ways including consumption or contact with contaminated food and water, insect bites, or through sexual contact. The type of disease, its severity, and symptoms can vary widely depending on the protozoa causing the infection. Common symptoms can range from nausea, abdominal discomfort, and diarrhea to more severe manifestations like fever, chills, and body aches for systemic infections like malaria. Some types of protozoal diseases can progress over time and cause long-term damage to organs like the intestine, liver, and brain. The diseases can affect many different systems in the body but primarily target the immune and digestive systems. The impact and presentation of these conditions can greatly differ based on the type of protozoa, the patient's overall health, and their immune response.