Malathion is a pesticide that is widely used in agriculture, residential landscaping, public recreation areas, and in public health pest control programs such as mosquito eradication. In the US, it is the most commonly used organophosphate insecticide.
The average incubation period for the flu is 2 days, but it can last anywhere from 1 to 4 days in healthy adults.
The rhinovirus' (common cold) incubation period is between 12-72 hours. Most people show symptoms closer to the 72 hour mark, but it depends on your immune system and the virus you contract. Influenza's incubation period is 1-4 days with 2 days being the most common for showing symptoms. There are many viruses that cause cold and flu symptoms that are not the common cold or influenza. If you were exposed to one of those it may take up to 7 days before symptoms appear.