Ya te vacunaste contra la gripe?
Here is an interesting program Argentina has implemented.
They know that any novel influenza will probably start in the poor favelas in the country.
So, they target those areas, by going for the mother making sure they vaccinate their male babies for free. They know the other children will get vaccinated
“The price of freedom is the willingness to do sudden battle anywhere, any time and with utter recklessness.”
― Robert A. Heinlein, The Puppet Masters