| It has been estimated that 30 to 50 percent of the world's human population has been infected with Toxoplasma and harbors the clinically inapparent cyst form. |
| In an inapparent infection, there is no outward sign that an infectious agent has entered that person at all. |
| Such inapparent infections and the chronic low-level stimulation of the immune system associated with life in unsanitary conditions may mean that nutrients go to support the body's immune response rather than growth. |
| In animals, RVF may be inapparent in non-pregnant adults, but outbreaks are characterised by the onset of abortions and high neonatal mortality. |
| Chronic infection with S. stercoralis is often inapparent, but it can cause gastrointestinal, cutaneous, or pulmonary symptoms. |
| In two of these establishments, there was an inapparent infection in indigenous cattle, while in the third establishment clinical signs were observed in five animals. |
