Although the vaccine is highly effective, it can have adverse side effects for about one in 100,000 people and kills one in a million. (fortune.com)
But the small viruses that deliver therapeutic genes can have adverse side effects at high doses. (sciencedaily.com)
There is also a «real» medicine that has proven effects on colic, but since it also has adverse side effects it is usually only given to children with particularly severe colic. (easybabylife.com)