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.
According to information from the US Centers for Disease Control and Prevention (CDC): The typical incubation period for influenza is 1-4 days (average: 2 days). Adults shed influenza virus from the day before symptoms begin through 5-10 days after illness onset.