Today, few question the legitimacy of a vaccination. Even fewer people consider a time when vaccinations were completely nonexistent. It is bizarre to think we owe our thanks to a cow, a dairymaid, an eight-year old boy, and the doctor who made a connection between them all.

People refer to Dr. Edward Jenner as “the father of immunology”. Immunization was not new, but Jenner was the first to study and document vaccination use. His curious experiment has saved an innumerable amount of human lives.

Smallpox was the greatest killer of Jenner’s time. In its most common form, the virus killed about 30% of those who caught it. It was the most feared disease that reached every part of society – even royalty suffered from it.

Smallpox is a virus that causes flu-like symptoms later accompanied by raised pink spots that grow over time. The spots cover the entire body. If the victim recovers, the blisters will shrivel up and fall off. They often leave behind sunken scars.

A similar but far less deadly disease than smallpox, is cowpox. This virus, which originates from cows, can transfer from animals to humans. It wasn’t uncommon for dairymaids to experience the mild infection. They would feel run down for a couple of days and develop some pocks, usually on their hands. Other than this, the sickness was harmless and did not cause any concern.

At the young age of thirteen, Jenner was an apprentice to a country surgeon. During his apprenticeship he overheard a dairymaid working nearby say, “I shall never have smallpox for I have had cowpox. I shall never have an ugly pockmarked face.”

Jenner took note of dairymaids’ natural immunity to smallpox. Many believed that those who had contracted cowpox were immune to smallpox.

Years later in 1796, a dairymaid consulted Jenner about a rash on her hand. Seeing the mildness of the infection, he diagnosed her with cowpox. She later verified to him that one of the cows she was working with recently had cowpox. Jenner saw this as his golden opportunity to prove the disease’s protection from smallpox.

To test his hypothesis, Jenner needed someone who never contracted cowpox or smallpox before. His gardener’s eight-year old son served as a perfect candidate. Jenner collected drops of fluid from the sores on the dairymaid’s hands and injected a small amount into the healthy boy’s arm. The boy became mildly ill with the cowpox infection, but recovered about a week later.

Two months later, Jenner injected some fluid from a smallpox sore into the young boy. As Jenner expected, the boy never became sick. To confirm his findings, Jenner continued to test the boy’s immunity. Hi various experiments all proved his hypothesis correct.

Jenner soon coined the word “vaccination”, of which the root word is derived from the Latin word “vacca”, meaning cow. Jenner published his research and discoveries, excited to share his success with the world.

Despite the success of Jenner’s techniques and findings, he faced opposition from others in the medical field. One criticizism was that cowpox wasn’t common. It was usually found in rural areas with farms having cows and dairymaids. This meant many doctors would have to get the vaccine from Jenner.

Edward Jenner continued to attempt to win approval as well as spread his new vaccine to the world. He came up with new, easy ways to have the cowpox matter widely transported. He was successful in his commitment to his scientific discovery.

Jenner’s work helped eradicate smallpox. Samples of the virus only exists in two labs permitted and trusted to secure it.

Jenner himself laid the foundation of vaccination as we know it today.

To learn more about the various vaccines that have been made since Jenner’s development, see our main vaccinations page.

Passport Health specializes in travel medicine, to schedule an appointment for your upcoming trip call or book online now.

How do you feel about Dr. Edward Jenner’s experiments? If you were living during his time, would you agree with his testing on an eight-year old boy? Leave your comments below, on Facebook, or via Twitter.

Have you thought about becoming infected with an illness that you were vaccinated against? Few people do. Many vaccines only need a single shot, but not all of them. Booster shots are key in preventing the return or contraction of certain diseases. But, some individuals overlook their importance in sustaining disease immunity.

Why Do I Need A Booster Vaccine?

In the 1950’s, a diphtheria epidemic in Russia caused more than 750,000 cases. The majority of cases were in children. But, it wasn’t until 1958 that universal childhood immunization began. As a result, diphtheria cases decreased dramatically by 1963.

In the later years, a childhood vaccination schedule had to be completed for school entry. Case reports fell, and there was hope for elimination. But, diphtheria made an explosive comeback in Russia thirty years later.

In 1993, a major outbreak occurred. Except this time, the majority of cases were in adults.

“Most experts attribute the increase in diphtheria to failings in the Russian immunization program,” said Celestine Bohlen, in a New York Times article published during this second epidemic outbreak. “[This] allow[ed] a high number of infants to be turned down for the normal schedule of inoculations for medical reasons, while not keeping many adults, particularly those from age 20 to 50, up to date on their immunizations.”

This second diphtheria outbreak was different. Most cases were in adults. Thirty years earlier, the majority of cases were pediatric. A connection between the lack of booster vaccines and this outbreak was clear.

A booster vaccine could have prevented the second diphtheria outbreak. It is important to stay up to date on booster vaccines to avoid incidences such as this.

Why Do Some Infections Require Booster Vaccines?

One can never be sure that a sickness won’t re-emerge and put them at risk. It is necessary to know whether a vaccine from a certain disease requires a booster later on.

Booster need depends on a variety of factors including disease progression and immunological memory.

Immunological memory refers to the ability of the immune system to respond to a detected pathogen. The faster the immune system can recognize a pathogen and prevent a sickness, the better. Whether it is necessary to boost immune memory with a follow-up shot depends on the disease’s speed of progression.

If enough time has passed since the vaccination, and the disease can progress rapidly. It may even spread faster than the body can respond. In cases involving slow-moving infections, the immune memory is activated with plenty of time to respond. In these instances, a booster vaccine is not necessary to maintain immunity.

“Pediatricians and family doctors must begin to anticipate the need to provide booster vaccinations for several of the newer vaccines introduced in the recent years,” said Michael Pichichero, with the Rochester General Research Institute, who has studied booster vaccines in various states.

No one wants to get infected with an illness they thought they were immune to. Sometimes, it can be hard to remember. Long period of time can pass without needing a booster – the tetanus booster is only needed every ten years.

What Vaccines Require Boosters?

Other vaccines may need a booster more often, such as the annual dose for the flu.

Travel Vaccinations that Require Boosters:

• Anthrax
• Hepatitis A
• Hepatitis B
• Hepatitis A & B
• Japanese Encephalitis
• Meningitis
• Polio (for some individuals)
• Rabies (pre- and post-exposure)
• Typhoid
• Yellow Fever

Routine Vaccinations that Require Boosters:

• Measles, Mumps, Rubella
• Chickenpox
• HPV
• Tetanus, Diphtheria and Pertussis
• Influenza

It is not only important to check if you will need a booster vaccine, but also to remember when it will be needed. You can check the adult vaccination schedule recommended by the CDC.

To learn more about these immunization or titer testing, see our vaccinations and titer testing portals.

If you are unsure of your vaccination history, consider titer testing to learn if you are immune. Your local Passport Health clinic can help, book your appointment today by calling or schedule online now.

Have you ever been infected with an illness you thought you were immune to? Share your thoughts on booster vaccines and their importance to your health in our comments section below, on Twitter or via Facebook.

Namibia is a popular safari destination on the southwest coast of Africa. Not only is it a great place for a safari, but also the country also offers countless other adventures. If you are planning an outdoor adventure to Namibia, don’t forget to plan ahead. Check out our health tips for travel to Namibia and a brief guide of what you can do.

Which Vaccines Do I Need For Namibia?

Before heading out for a Namibia, it’s important to receive a few key vaccinations. The World Health Organization and Centers for Disease Control recommend the following vaccines:

• Hepatitis A
• Typhoid
• Hepatitis B
• Rabies
• Yellow Fever
• Routine Vaccinations

To learn more about these infections and their vaccines, see their individual pages. Prepare before you go by visiting your local Passport Health clinic. Schedule today by calling or booking online now.

Mosquito-borne Diseases In Namibia

Mosquito bites can lead to malaria, a deadly disease. There is no vaccination against malaria. But, there are antimalarial medications that will protect you from infection. The CDC recommends mosquito nets, insect repellent and other related products.

Dengue is another mosquito-borne disease common in Namibia. Be sure to take proper precautions against mosquitoes.

Where Should I Visit In Namibia?

The Fish River Canyon is the second largest canyon in the world, and a popular destination. The 85 kilometer trail through the canyon is perfect for those up for a challenge. But, the trail is only open from May to the mid-September due to extreme temperatures the rest of the year. Travel plans to the canyon should be evaluated by a travel health professional. Schedule a travel health consultation with Passport Health four to six weeks before leaving.

If you prefer a less intense adventure, the Waterberg Plateau may be for you. The plateau is a pristine viewpoint to scope out many of the rare and endangered species in Africa. The park contains many self- and professionally- guided trails hikes are available.

The largest population of black rhinos in the world lives in Namibia’s Etosha National Park. It also has many waterholes that attract all types of African wildlife. This destination should be a part of any nature afficionado’s itinerary.

Namibia also has other great spots to stop at such as Swakopmund. It’s a great location for skydiving, kitesurfing and incredible views of sand dunes. No matter the type of person, Namibia has something to offer for everyone.

What are some Namibian travel destinations that you would add to your safari roadmap? Leave an answer in the comments below or on Passport Health’s Facebook and Twitter pages!