Paratyphoid fever is an illness caused by the bacteria Salmonella paratyphi. It is similar to typhoid fever and is typically spread through contaminated food and water. Symptoms often include fever, abdominal pain, diarrhea, and headache. The illness can be serious, especially in young children and those with weakened immune systems. Diagnosis is usually made through blood tests, and treatment often involves antibiotics. Preventive measures include practicing good hygiene, such as washing hands and ensuring food and water are safe to consume. Vaccines for typhoid fever may offer some protection against paratyphoid fever as well.