Global travel between industrialized and developing countries is now common.
But contagious diseases do not recognize borders;
pandemics such as SARS and COVID-19 occur rapidly;
(and world leaders panic to close their borders).
Countries with high rates of immigration see their new citizens frequently
returning to visit relatives, incubating contagious disease on their return.
Vaccsbook integrates vaccination schedules of all countries,
and the vaccination records of all patients,
into a single database,
not separate databases for each country, state, or province.