Itdeals withan earlierstage in the processofgenecoding for biologicalactivity, andcould thereforeoffertherapiesanddiagnosticmarkets that catch a diseasemuch closer to the source.
They are not protected at all at that age by the DTaP, and since a huge percentage of even appropriately vaccinated people can still catch and transmit the disease, parents cannot rely on the theory that their baby is safe from the disease if exposed to them.
If some reputable agency or study declared that eating five apples a day would prevent cancer and heart disease, the price of apples would soar until growers could catch up with demand.