A vaccine is a biological preparation that provides immunity to a specific disease. It usually contains a weakened or inactive form of the disease which then stimulates the body's immune system to recognize it as a threat and destroy it, giving it the means to destroy any further versions of it that it may encounter in the future.

Vaccines have been proven to be the most effective method of preventing and eradicating infectious diseases. The complete eradication of smallpox and significant reduction of polio, measles, and tetanus have proven as such.

Vaccines lead to a phenomenon known as "herd immunity" in which diseases cannot spread with ease as the majority of a population are vaccinated. However, herd immunity can only work if a certain percentage of the population is vaccinated.

Most vaccines are delivered via injection, although notable exceptions include the polio vaccine which is often delivered orally. This method was found to have certain advantages as it allowed for administration by staff without formal training, and reduced the risk of blood contamination. 

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They are also testing a fourth dose of the current vaccine against a fourth dose of the Omicron-based vaccine in people who received a third dose of the vaccine three to six months earlier.


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The recommendation comes after data showed that after the fourth dose, a person has 3-5 times protection against severe morbidity.

How did we face epidemics before the age of vaccines?

From the lepers in the Bible to the victims of the Plague and the Spanish flu – the main tools to combat contagious diseases were isolations and lockdowns.

By Dr. Keren Landsman/Davidson Institute of Science Education

Amid Omicron, Israel must move beyond COVID-19 Green Pass - editorial

Omicron's less deadly implications, especially for the fully vaccinated, means that new ways must be found to create environments that are as safe as possible.

Pfizer CEO sees annual COVID vaccine rather than frequent boosters

Pfizer could be ready to file for approval for a redesigned vaccine to fight Omicron, and mass produce it, as soon as March.


Israel must clarify its confusing COVID-19 rules - editorial

If Israel is to provide a model for dealing with the pandemic and live up to its worldwide reputation as the “vaccination nation,” it’s time for some clarity.

Two-thirds of corona jab reactions caused by placebo effect - study

A third of clinical trial participants who received no vaccine reported systemic adverse advents including headache and fatigue.

Don’t punish under-fives for being too young to be vaccinated - opinion

Why are we penalizing children too young to vaccinate? Why are we penalizing parents and families who have young children?


Ivermectin prescriptions for COVID-19 ineffective, yet covered by insurance - study

Insurers are heavily subsidizing the prescription drug ivermectin, despite studies finding it ineffective for treating COVID-19.

Vials with Pfizer-BioNTech and Moderna coronavirus disease (COVID-19) vaccine labels are seen in thi

Education needed to overcome COVID-19 vaccine hesitancy, even in UAE - study

Only 38.8% of university students participating in study reported being vaccinated; 18% thought there was no vaccine against COVID-19.

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