The live virus must then be weakened for human use. ... Infants still have immature immune systems and immature vital organs that could place them at high risk of acquiring an infection that could eventually cause them long term effects. ... Formaldehyde which is a very dangerous chemicals to human health. ... Then there is the Human Cell Line. ... This virus was given to humans from monkeys through vaccines. ...

• Word Count: 2796
• Approx Pages: 11
• Has Bibliography
• Grade Level: High School