Brady Collins
Vaccines are designed to prevent contagious diseases and have been proven to be effective in reducing the risk of infection and transmission. For example, the measles vaccine has significantly reduced the number of measles-related deaths worldwide. However, the recent measles outbreak in Texas and the US has raised concerns about the role of vaccines in preventing contagion. While vaccines are not 100% effective, they offer a strong defence against contagious diseases, and evidence shows that high vaccine uptake rates are necessary for achieving herd immunity. The COVID-19 vaccines are another example of effective contagion prevention, as they reduce the risk of long-term symptoms and shorten the duration of infection and transmission.
| Characteristics | Values |
|---|---|
| Vaccines prevent contagion by | Inducing immunity |
| Contagious diseases preventable by vaccines | Measles, mumps, chickenpox, diphtheria, influenza, HPV, rotavirus, RSV, COVID-19 |
| Vaccines prevent serious illness | Yes |
| Vaccines prevent death | Yes |
| Vaccines prevent permanent damage | Yes |
| Vaccines prevent disease spread | Yes |
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What You'll Learn
Measles vaccine prevents contagion and severe symptoms
Measles is a highly contagious disease caused by a virus that spreads easily through the air and settles on surfaces. It infects the respiratory tract and then spreads throughout the body. The virus can be spread when an infected person breathes, coughs or sneezes, and it can be serious, and even deadly. Measles is most common in children, and it can cause severe complications, especially in those younger than five years old.
The Measles, Mumps, and Rubella (MMR) vaccine provides long-lasting protection against all strains of measles. It is safe and helps the body fight off the virus. The best protection against measles is to be vaccinated. The vaccine is safe and effective, and it helps the body fight off the virus. The CDC recommends that children get the first dose of the measles vaccine between 12 and 15 months of age and the second dose between 4 and 6 years of age, before they start school. The shortest time between the first and second dose of the measles vaccine is 28 days. The MMR vaccine is also recommended for adults, especially if they are planning to travel.
Measles symptoms appear 7 to 14 days after contact with the virus. A person with measles can spread the virus four days before the rash appears and four days after. About 90% of people who haven't had measles or haven't been vaccinated will become infected when exposed to someone with measles. Measles can cause serious health complications, including ear infections, diarrhoea, pneumonia, and encephalitis. In rare cases, measles can cause brain or nervous system illness years after infection, and it can also lead to permanent damage, including hearing loss, infertility, and blindness.
Before the introduction of the measles vaccine in 1963, major epidemics occurred approximately every two to three years, causing an estimated 2.6 million deaths each year. Despite the availability of a safe and effective vaccine, measles remains one of the leading causes of death among young children globally.
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Chickenpox vaccine protects against fever, headache, and rash
Chickenpox is a highly contagious disease caused by the varicella-zoster virus. It causes an itchy rash and can sometimes lead to complications. The chickenpox vaccine is a two-dose series of shots that provide protection against chickenpox. The vaccine prevents most cases of severe illness and protects against severe illness in those who still get infected. It is safe and effective, and side effects are usually mild and go away on their own.
The chickenpox vaccine has been shown to protect against fever, headache, and rash. While fever and rash are common side effects of the vaccine, they are usually mild and less severe compared to the actual disease. For instance, after the first dose, 7 out of 100 children had a fever, while 4 out of 100 children had a fever after the second dose. Similarly, 3 out of 100 children had a chickenpox-like rash after the first dose, compared to 1 out of 100 after the second. Furthermore, vaccinated people who still get infected often experience little to no fever and fewer blisters.
The chickenpox vaccine also protects against other severe symptoms of chickenpox, such as lung or liver infections, meningitis, febrile seizures, and severe infections. While rare, some people have reported severe allergic reactions to the vaccine, including swelling of the face and throat, difficulty breathing, and a fast heartbeat. However, these reactions are typically mild and less severe compared to the potential complications of the disease itself.
In summary, the chickenpox vaccine effectively protects against fever, headache, and rash associated with chickenpox. It significantly reduces the severity of these symptoms and the risk of developing serious complications from the disease. As a result, the vaccine helps to protect individuals and communities, especially those who are vulnerable and cannot receive the vaccine.
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HPV vaccine prevents genital warts and cancers
Vaccines are designed to protect us from contagious diseases. For instance, measles is a highly contagious disease that can cause severe disease, complications, and even death. The best protection against measles is the MMR vaccine, which provides long-lasting protection against all strains of the disease.
Similarly, the HPV vaccine prevents genital warts and cancers. HPV, or human papillomavirus, is the most common sexually transmitted infection in the United States. It is spread by skin-to-skin and sexual contact. Certain strains of HPV are responsible for most cervical cancers, genital warts, and some rare forms of cancer of the anus, vagina, penis, mouth, and throat. The HPV vaccine is highly effective in preventing these infections and, consequently, reducing the risk of associated cancers and genital warts.
The HPV vaccine has been proven to be safe and effective for individuals who are or will be sexually active. It is most effective when administered before exposure to the virus, ideally between the ages of 11 and 12. The CDC recommends two doses of the vaccine for this age group, with a gap of 6 to 12 months between the shots. The vaccine series can be started as early as age 9.
The HPV vaccine provides protection against various high-risk HPV strains. Gardasil-9, the vaccine distributed in the United States, protects against nine HPV types (6, 11, 16, 18, 31, 33, 45, 52, and 58). HPV-16 and HPV-18 are associated with the majority of cervical cancers, while HPV-6 and HPV-11 cause 90% of genital warts. By vaccinating against these strains, the HPV vaccine significantly reduces the risk of cervical cancer and external genital warts.
The availability of the HPV vaccine has led to a notable decrease in HPV-related infections and cancers. Among young adult women, infections with HPV types that cause most HPV cancers and genital warts have dropped by 81%. Similarly, vaccinated women have experienced a 40% decrease in cervical pre-cancers caused by HPV types linked to cervical cancer. These statistics highlight the effectiveness of the HPV vaccine in preventing genital warts and cancers.
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COVID-19 vaccines reduce transmission duration
Vaccines have been crucial in the fight against COVID-19. While it is well-established that COVID-19 vaccines protect against severe outcomes of acute SARS-CoV-2 infection, such as hospitalisation and death, there has been uncertainty about their ability to reduce transmission and the duration of post-COVID-19 symptoms, commonly referred to as 'long COVID'.
The challenge of directly measuring transmission reduction has led to varied expert opinions on the impact of COVID-19 vaccines in reducing transmission. Some experts suggest that if a vaccine reduces the number of infection events, including asymptomatic cases, it could indicate a reduction in transmission. This theory posits that fewer infected individuals mean fewer people spreading the virus. However, others argue that this correlation may not be direct, and transmission rate analysis should consider the likelihood of an exposed, unvaccinated person being infected by a vaccinated individual.
Viral load measurements are proposed as a potential efficacy measure, offering a better approach than solely relying on the duration of infection. While COVID-19 vaccine developers face difficulties in demonstrating transmission reduction based on infection rates, mRNA vaccines are believed to potentially have an edge in transmission impact due to antibody-skewing mechanisms.
Although there is no consensus on a benchmark for vaccine efficacy in transmission reduction, experts agree that the current 50% benchmark is inappropriate and that establishing a new benchmark is challenging due to the inherent difficulties in measuring transmission. Despite the lack of consensus on the impact of COVID-19 vaccines in reducing transmission duration, studies suggest that vaccination may reduce the risk of post-COVID-19 symptoms in general adult populations.
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Rotavirus vaccines prevent severe diarrhoea and dehydration
Rotavirus is a highly contagious gastrointestinal infection that mostly affects young children and babies. It is caused by a virus that spreads through hand-to-mouth contact, often when changing a baby's nappy. Rotavirus causes severe diarrhoea and vomiting, which can lead to dangerous levels of dehydration. In some cases, children may need to be hospitalised to receive IV fluids.
The rotavirus vaccine helps to prevent this by protecting children from getting rotavirus. The vaccine is given to babies in two doses when they are 8 and 12 weeks old. It prevents rotavirus infections in about 8 out of 10 babies who have it. The vaccine is very effective at stopping babies and young children from getting infected by rotavirus. Before the vaccine was available, rotavirus was the number one cause of severe diarrhoea in young children. It led to 55,000-70,000 hospitalisations each year.
In addition to preventing rotavirus, the vaccine can also make symptoms less severe if a vaccinated child does get infected. While the disease used to be very common, vaccines have kept many children healthy. Since the introduction of the vaccine, the number of children who get rotavirus infections has dropped significantly.
It is important to note that the rotavirus vaccine does not protect against diarrhoea and vomiting caused by other illnesses, such as norovirus. However, it is specifically effective in preventing severe diarrhoea and dehydration caused by rotavirus infections.
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Frequently asked questions
Vaccines are designed to prevent the spread of contagious diseases. Vaccines are not 100% safe or effective, but they significantly reduce the risk of infection and transmission. For example, the measles vaccine has helped prevent millions of deaths worldwide.
Contagious diseases such as measles, chickenpox, rotavirus, mumps, and COVID-19 can be prevented through vaccination.
Vaccines work by priming the body's immune system to recognize and fight off specific viruses or bacteria. This means that if a vaccinated person comes into contact with the disease, their body will be better equipped to clear the infection quickly, reducing the risk of transmission to others.
While vaccines are generally safe and effective, they can sometimes cause minor side effects, such as fatigue and fever. In rare cases, more serious adverse reactions may occur. However, the risks associated with vaccine-preventable diseases are typically much higher. For example, measles can cause brain swelling and pneumonia, and COVID-19 can lead to long-term symptoms and complications.
