Immunizing family members and close contacts of infants and those at high risk for infection from whooping cough (pertussis) and influenza is an effective strategy. Research is presented with Portland’s Doernbechers Children’s Hospital taking a pioneer role in this approach. See:
Other studies have shown that up to 75% of infant pertussis cases are acquired from household contacts and that cocooning (immunizing the family) could lead to a 70% reduction in pertussis cases for infants less than 3 months old. We know that it is household contacts that are the most common source of pertussis infection for newborns and young infants.
I support this strategy (cocooning) whole heartedly as opposed to the latest (2012) recommendation of injecting at least 330 micrograms of aluminum into pregnant women by giving all pregnant women the Tdap. There are absolutely no safety studies where pregnant women, or even pregnant animals, are injected with such a toxic dose of the known neuro-toxicant aluminum. We know not to exceed more than 4-5 micrograms of aluminum per Kg of body weight per day for premature infants, so the safe dose for the unborn child must be much lower than that!