If your unvaccinated offspring is going to be in contact with their offspring, it damned well is those parents' business. https://t.co/f8OLZCNQId
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For those that want the reality, pertussis vaccine is effective but it wanes, thus asking for boosters in adults contacting a newborn. Maternal vaccination is > 90% effective protection < 2 month olds. For adults boosters are ~100% for the first year then wane (~80% at 4 years).
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