Flu shots are very effective in preventing influenza and hold very few risks and side effects. Many health insurance plans cover flu shots, leaving you to bear an out-of-pocket expense from nil to a co-pay of up to 15. Several employers offer the insurance coverage to their employees to keep them protected from the seasonal flu attacks. Flu shots can be obtained from a doctor, health service unit, local drug store and some supermarkets. Pregnant women are warned against taking the flu shots without consulting a physician. Influenza is a respiratory infection and the resultant illness like cough and muscle ache lasts up to a fortnight. Flu vaccine is prepared from the fluids of chick embryos. The average cost of a flu shot is $10 to $30.