More threads by David Baxter PhD

David Baxter PhD

Late Founder
Measles cases climb sharply in Europe
CBC News
Augist 21, 2018

Half of cases are in Ukraine — but Italy, France, Greece also see significant rise

The number of measles cases in Europe jumped sharply during the first six months of 2018, and at least 37 people have died, the World Health Organization says.

The UN agency's European office said Monday more than 41,000 measles cases were reported in the region during the first half of the year — more than in all 12-month periods so far this decade.

The previous highest annual total was 23,927 cases in 2017. A year earlier, only 5,273 cases were reported.

child-with-measles.jpg

The agency said half — some 23,000 cases — this year occurred in Ukraine, where an insurgency backed by Russia has been fighting the government for four years in the east in a conflict that has killed more than 10,000 people.

France, Georgia, Greece, Italy, Russia and Serbia also had more than 1,000 measles infections each this year.

Measles — among the world's most contagious diseases — is a virus spread in the air through coughing or sneezing. It can be prevented with a vaccine that's been in use since the 1960s, but health officials say vaccination rates of at least 95 per cent are needed to prevent epidemics.

Measles typically begins with a high fever, and sometimes a runny nose, cough, and red and watery eyes. Small white spots can also appear inside the cheeks. Later, a rash develops on the face and neck and spreads down the body.

Most people who develop measles recover, but it can cause serious complications that can turn deadly. Complications include blindness, encephalitis (brain swelling), severe diarrhea leading to dehydration, ear infections and severe respiratory infections, according to the World Health Organization.

Children under five years of age are the most vulnerable. And despite the availability of a vaccination, measles is one of the leading causes of death among young children around the world.

Vaccine skepticism remains high in many parts of Europe.

Italy introduced a law in 2017 requiring parents to vaccinate their children against measles and nine other childhood diseases. Romania has also passed a similar bill, including hefty fines for parents who didn't vaccinate their children.

The WHO on Monday called for better surveillance of the disease and increased immunization rates to prevent measles from becoming endemic.

Advice for Canadian travellers
The Canadian government first issued a travel health notice about measles in Europe in August 2017, and last updated it in April 2018.

It advises Canadian travellers to make sure their measles vaccinations are up to date, as well as practising normal infection prevention, including frequent handwashing.

The advisory also says travellers should see a health-care provider if they develop symptoms of measles while travelling or after they return to Canada.
 

David Baxter PhD

Late Founder
Re: Herd Immunity vs. the Measles epidemic

Vaccines Protect Your Community
Vaccines.gov
December 2017
Did you know that when you get vaccinated, you’re protecting yourself and your community?

This concept is called community immunity, or herd immunity. And it’s an important reason for you and your family to get vaccinated — so you can help keep yourselves and your community healthy.

How does community immunity work?
Germs can travel quickly through a community and make a lot of people sick. If enough people get sick, it can lead to an outbreak. But when enough people are vaccinated against a certain disease, the germs can’t travel as easily from person to person — and the entire community is less likely to get the disease.

That means even people who can’t get vaccinated will have some protection from getting sick. And if a person does get sick, there’s less chance of an outbreak because it’s harder for the disease to spread. Eventually, the disease becomes rare — and sometimes, it’s wiped out altogether.

Who does herd immunity protect?
Community immunity protects everyone. But it’s especially important because some people can’t get vaccinated for certain diseases — such as people with some serious allergies and those with weakened or failing immune systems (like people who have cancer, HIV/AIDS, type 1 diabetes, or other health conditions).

Community immunity is also important for the very small group of people who don’t have a strong immune response from vaccines.

If vaccines have wiped out some diseases in the United States, can we stop getting vaccinated for them?
No. Many vaccine-preventable diseases that we don’t see much in the United States still make people sick in other countries. So it’s possible for travelers to bring these diseases back to the United States, where they could then spread. If we stop getting vaccinated, we won’t be protected from these diseases — community immunity protects us only if enough people continue to get vaccinated.

If you’re traveling outside of the United States, you may need to get vaccines to keep you healthy and safe. Learn more about travel vaccines.

Herd immunity at work: Pneumococcal vaccines
Pneumococcal disease can cause serious infections of the ears, lungs, blood, and brain. Although it’s common in young children, older adults are most at risk for serious pneumococcal infections.

Since the pneumococcal vaccine was approved for use in children, the number of older adults hospitalized for pneumococcal disease has gone way down. This tells us that vaccinating infants protected older adults from the spread of serious pneumococcal infections before a vaccine for older adults was available.
 

David Baxter PhD

Late Founder
Re: Herd Immunity vs. the Measles epidemic

What is herd immunity?
VaccinesToday.eu
February 7th, 2015

"Herd immunity is a form of immunity that occurs when the vaccination of a significant portion of a population (or herd) provides a measure of protection for individuals who have not developed immunity."



It arises when a high percentage of the population is protected through vaccination against a virus or bacteria, making it difficult for a disease to spread because there are so few susceptible people left to infect.

This can effectively stop the spread of disease in the community. It is particularly crucial for protecting people who cannot be vaccinated. These include children who are too young to be vaccinated, people with immune system problems, and those who are too ill to receive vaccines (such as some cancer patients).

The proportion of the population which must be immunised in order to achieve herd immunity varies for each disease but the underlying idea is simple: once enough people are protected, they help to protect vulnerable members of their communities by reducing the spread of the disease.

However, when immunisation rates fall, herd immunity can break down leading to an increase in the number of new cases. For example, measles outbreaks in the UK and pertussis outbreaks in the US have been attributed to declining herd immunity.

Using animation, this video helps to explain how herd immunity works and what happens when herd immunity breaks down. It is designed to be used as an educational tool, ideally supported by an experienced trainer.


Dr. Adam Finn who describes how vaccines work and why we all have a role in ensuring that they are effective.

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