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.
Viral. 1  Look for: 2  What to do: 3  See your family doctor or eye doctor to confirm the diagnosis. If itâs viral, there is no antibiotic treatment that will help. 4  What to know: 5  The infection will clear up on its own and in its own time, usually seven to 10 days. It is no longer contagious when discharge disappears. Tips to prevent your own pink eye epidemic. Pink eye can be caused by the same types of bacteria and viruses responsible for colds, ear infections, sinus infections, and sore throats.