The last week of April marks World Immunization Week, a
global public health campaign led by the World Health Organization to promote
the use of vaccines to protect people of all ages from vaccine-preventable
diseases. Over the past 50 years, global immunization efforts have saved an
estimated 154 million lives – roughly six people every minute – and vaccines
now protect against more than 30 serious diseases.
Vaccination coverage worldwide, however, has plateaued and
in some areas declined, leaving gaps in protection. In 2024, about 14.3 million
children missed their first dose of diphtheria-tetanus-pertussis (DTP3)
vaccine, and millions more missed measles and other routine immunizations.
Because many vaccine-preventable diseases are highly
contagious, high coverage is essential to protect communities. For example,
measles transmission can be halted only when at least 95% of the population is
immunized, yet global coverage remains below this level, contributing to
periodic outbreaks.
Routine immunization programmes map out when key vaccines
should be given from infancy through adulthood, including boosters and catch-up
schedules for those who have missed doses. Many countries provide childhood
vaccines at no cost through national programmes, and adults can access
recommended vaccines through health services.
If you are unsure about your immunization history or what
vaccines are recommended for your age and location, check with your healthcare
provider, local health department, or national immunization registry.
Flu vaccination timing globally
For seasonal influenza, timing varies by hemisphere. In the
Northern Hemisphere, flu season typically peaks between December and March,
while in the Southern Hemisphere it peaks between June and September. Because
it takes several weeks after vaccination for your body to build immunity and
protection is strongest for 3-4 months, it is best to get your annual flu
vaccine before the peak season in your region. Even when the virus is already
circulating, vaccination can still reduce your risk of severe illness.
You can receive flu vaccinations at medical clinics,
pharmacies, or through national immunization programmes – check what options
are available in your country.
