The bacterium Bordetella pertussis is the primary whooping cough cause. There are no other causes, and the infection follows no distinct seasonal pattern. People may become infected with the bacteria by breathing in tiny droplets released into the air by an infected person's cough or sneeze.
There are approximately 1,892.7 milliliters in 1 half-gallon of volume. That works out to 3,785.4 milliliters per gallon, 1.892 liters per half-gallon and 3.785 liters per gallon.
One gallon contains 4 quarts, which is also equivalent to 8 pints or 16 cups of liquid. Other countries use liters over gallons when it comes to liquid measurement. One liter is roughly the equivalent of 1 quart. Thus, 4 liters are approximately the same as 1 U.S. gallon.