However, at the present time in our country, virtually nobody under age 35 has been vaccinated.
The family said they had no idea how Mr Colfer-Williams got measles as no close family member has it, including his three-year-old daughter who has been vaccinated.
Any staff member who has not been vaccinated must wear a mask while caring for any patient.
UN, the proportion of children in the Pool vaccinated against tuberculosis has plummeted from 90% in 1990 to 37% in 2000.
But Congressman, the scientific community has done observational studies of vaccinated versus unvaccinated children, comparing autism rates in children whose parents chose not to vaccinate.
The appeal by PHW for parents to make sure their children are vaccinated against measles has taken an increasingly urgent tone, following the death of Mr Williams at his home in Port Tennant Road in Swansea.
Another oddity is that although it is humans who are vaccinated, the vaccine has its impact inside the gut of a mosquito, after the insect has taken its meal.
"Polio man" is in his late 20s, has never suffered from polio and was vaccinated against the disease.
"It has memory, similar to when we were vaccinated against infectious diseases" like measles.
As well as the annual flu nasal spray, the joint committee on vaccination and immunisation has recommended that S3 girls and boys also be vaccinated against meningococcal C.
While uptake has improved in recent years- children who do not get vaccinated on time, and older children who missed out when the uptake was lower, mean that there are still enough unvaccinated people to allow measles outbreaks to occur.
The DoH has therefore launched a campaign to encourage at-risk groups to get vaccinated and a new website, called Winterwatch, will be launched later this month to provide winter-related health data.
The move has been welcomed Community Pharmacy Wales who say it will encourage more people to get vaccinated.
BBC: Flu jab given at some pharmacies in Wales for first time
The cost of a hepatitis B shot to prevent liver cancer has plunged 68% over a similar period, allowing millions of kids to be vaccinated.
Her county has had 200 cases this fall and winter, many of them infants who are too young to be vaccinated and have been exposed to an adult with whooping cough.
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