Toxoplasma gondii is an obligate intracellular parasite that causes the infectious disease toxoplasmosis. It is capable of infecting all warm-blooded animals. In humans, it commonly causes mild flu-like symptoms but can cause serious issues in those with weak immune systems or congenitally acquired infections. It has a complex lifecycle involving sexual reproduction in cats and asexual reproduction in other hosts. Acute infection may be asymptomatic while latent infection involves tissue cyst formation that can reactivate if immunity wanes.