It travels from one person to another through the air. It's easy to catch, antibiotics don't kill it, and crowded conditions like a troop ship bringing soldiers home from Europe in 1918, or a vessel with a hold full of alien migrants, are perfect for spreading the disease around the world. It can happen again. But if you've been immunized, it won't happen to you. Another good reason to get a flu shot is because in a leaner Coast Guard, employee absenteeism is an important consideration.
Immunization is an important and cost effective form of preventive medicine.
Not only does it save organizations money in lost work days, employees are generally healthier when they're immunized, which reduces health care costs. This is very important. Free water in the body helps with temperature regulation, and keeps body systems working at peak performance. That way, if your muscle gets sore, you won't be reminded of it every time you move. Although they may have meant well, what they told you about doing push ups after your shot to make the soreness go away doesn't work.