Infrared heat may be a hot new trend in grilling, but this type of heat has been occurring naturally since the dawn of time. In fact, everything with a temperature above absolute zero (which is equal to -459.67 degrees Fahrenheit or -273.15 degrees Celsius) emits at least a little infrared radiation.
For example, bacterial and viral causes of pinkeye are almost always contagious and are spread from person to person. However, pinkeye caused by allergens and chemical irritants is not contagious by person-to-person contact. Pinkeye that is contagious has an incubation period as long as 14 days. However, most doctors do not think that pinkeye becomes contagious to other people until symptoms start to develop.
My son's child care has a policy that children with pink eye stay home until they're no longer contagious. Pink eye (conjunctivitis) generally remains contagious as long as your child is experiencing tearing and matted eyes. Signs and symptoms of pink eye usually improve within three to seven days. When tearing and matted eyes are no longer present, it's appropriate for a child to return to school or child care. If the pink eye is caused by a bacterial infection, treatment with antibiotic drops or ointment for the eyes may be necessary.