Immunization coverage
Fact sheet N°378 April 2013
Key
facts
- Immunization prevents illness, disability and death
from vaccine-preventable diseases including diphtheria, measles, pertussis,
pneumonia, polio, rotavirus diarrhea, rubella and tetanus.
- Global vaccination coverage is holding steady.
- Immunization currently averts an estimated 2 to 3
million deaths every year.
- But an estimated 22 million infants worldwide are still
missing out on basic vaccines.
Overview
Immunization averts an estimated 2
to 3 million deaths every year from diphtheria, tetanus, pertussis (whooping
cough), and measles. Global vaccination coverage—the proportion of the world’s children
who receive recommended vaccines—has remained steady for the past few years.
For example, the percentage of infants fully vaccinated against
diphtheria-tetanus-pertussis (DTP3) was 83% in 2011, 84% in 2010 and 83% in
2009.
During 2011, about 107 million
infants worldwide got three doses of DTP3 vaccine, protecting them against
infectious diseases that can cause serious illness and disability or be fatal.
By 2011, 130 countries had reached at least 90% coverage of DTP3.
Current
levels of access to recommended vaccines
Haemophilus influenza type b (Hib) causes meningitis and pneumonia. Hib vaccine was
introduced in 177 countries by the end of 2011. Global coverage with three
doses of Hib vaccine is estimated at 43%.
Hepatitis B is a viral infection that attacks the liver. Hepatitis B
vaccine for infants had been introduced nationwide in 180 countries by the end
of 2011. Global hepatitis B vaccine coverage is estimated at 75%.
Human papillomavirus — the most common viral infection of the reproductive tract
— can cause cervical cancer, and other types of cancer and genital warts in
both men and women. Human papillomavirus vaccine was introduced in 43 countries
by the end of 2011.
Measles is a highly contagious disease caused by a virus, which
usually results in a high fever and rash, and can lead to blindness,
encephalitis or death. By the end of 2011, 84% of children had received one
dose of measles vaccine by their second birthday, and 141 countries had
included a second dose as part of routine immunization.
Meningitis A is an infection that can cause severe brain damage and is
often deadly. By the end of 2012—two years after its introduction—the
MenAfriVac vaccine, developed by WHO and PATH, was available in 10 of the 26
African countries affected by the disease.
Mumps is a highly contagious virus that causes painful swelling
at the side of the face under the ears (the parotid glands), fever, headache
and muscle aches. It can lead to viral meningitis. Mumps vaccine had been
introduced nationwide in 120 countries by the end of 2011.
Pneumococcal diseases include pneumonia, meningitis and febrile bacteremia,
as well as otitis media, sinusitis and bronchitis. Pneumococcal vaccine had
been introduced in 72 countries by the end of 2011.
Polio is a highly infectious viral disease that can cause
irreversible paralysis. In 2011, 84% of infants around the world received three
doses of polio vaccine. Only three countries—Afghanistan, Nigeria and
Pakistan—remain polio-endemic.
Rotaviruses are the most common cause of severe diarrhoeal disease in
young children throughout the world. Rotavirus vaccine was introduced in 31
countries by the end of 2011.
Rubella is a viral disease which is usually mild in children, but
infection during early pregnancy may cause fetal death or congenital rubella
syndrome, which can lead to defects of the brain, heart, eyes and ears. Rubella
vaccine was introduced nationwide in 130 countries by the end of 2011.
Tetanus is caused by a bacterium which grows in the absence of
oxygen, e.g. in dirty wounds or in the umbilical cord if it is not kept clean.
It produces a toxin which can cause serious complications or death. The vaccine
to prevent maternal and neonatal tetanus had been introduced in over 100
countries by the end of 2011. Vaccination coverage with at least two doses was
estimated at 70%, and an estimated 82% of newborns were protected through
immunization. Maternal and neonatal tetanus persist as public health problems
in 36 countries, mainly in Africa and Asia.
Yellow fever is an acute viral hemorrhagic disease transmitted by
infected mosquitoes. As of 2011, yellow fever vaccine had been introduced in
routine infant immunization programmers in 36 of the 48 countries and
territories at risk for yellow fever in Africa and the Americas.
Key
challenges
Despite improvements in global
vaccine coverage during the past decade, there continue to be regional and
local disparities resulting from:
- limited resources;
- competing health priorities;
- poor management of health systems; and
- inadequate monitoring and supervision.
In 2011, an estimated 22 million
infants worldwide were not reached with routine immunization services. About
half of them live in three countries: India, Indonesia and Nigeria.
Priority needs to be given to
strengthening routine vaccination globally, especially in the countries that
are home to the highest number of unvaccinated children. Particular efforts are
needed to reach the underserved, especially those in remote areas, in deprived
urban settings, in fragile states and strife-torn regions.
WHO
response
WHO is working with countries and
partners to improve global vaccination coverage, including through these
initiatives adopted by the World Health Assembly in May 2012.
The
Global Vaccine Action Plan
The Global Vaccine Action Plan
(GVAP) is a roadmap to prevent millions of deaths through more equitable access
to vaccines. Countries are aiming to achieve vaccination coverage of ≥90%
nationally and ≥80% in every district by 2020. While the GVAP should accelerate
control of all vaccine-preventable diseases, polio eradication is set as the
first milestone. It also aims to spur research and development for the next
generation of vaccines.
The plan was developed by multiple
stakeholders—UN agencies, governments, global agencies, development partners,
health professionals, academics, manufacturers and civil society. WHO is
leading efforts to support regions and countries as they adapt the GVAP for
implementation.
World
Immunization Week
The last week of April each year is
marked by WHO and partners as World Immunization Week. In 2013, more than 180
countries, territories and areas are expected to mark the week with activities
including vaccination campaigns, training workshops, round-table discussions
and public information campaigns. The theme of World Immunization Week is
“Protect your world – get vaccinated”. It aims to raise public awareness of how
immunization saves lives, encouraging people everywhere to vaccinate themselves
and their children against deadly diseases.
Reference