A health worker in Singapore accidentally received 5 doses of the emerging corona virus vaccine "Covid-19", so what happened to him after that? And what are the latest data on the side effects of Corona vaccines?

We start in Singapore, where an employee of the Singapore National Eye Center (SNEC) accidentally received the equivalent of 5 doses of the Pfizer-BioNTech vaccine against the Coronavirus, according to a report published by The Straits Times. As reported by Russia Today.

This happened during a vaccination exercise on January 14, and was due to human error resulting from the interruption of communication between members of the vaccination team, according to the Singapore National Eye Center on Saturday, February 6.

What happened to the employee?

According to the report, nothing happened to the employee, and he is in good health, without any negative reactions or side effects, and the employee was placed in Singapore General Hospital for further monitoring, before being discharged from the hospital two days later.

How did the error occur?

The National Eye Center of Singapore said that the agent responsible for diluting the vaccine was called to another order before diluting the vaccine, then another employee made a mistake, not knowing that the dose in the vial was not diluted, and gave the vaccination to the health worker concerned.

The bug was discovered within minutes after vaccination.

According to the US Centers for Disease Control and Prevention, the preparation of the Pfizer-Biontech vaccine includes diluting the vaccine ampoule with an amount of 1.8 milliliters of saline solution, then 0.3 milliliter of it is withdrawn, and injected to the person to be vaccinated.

Therefore, the mistake that was made, which was not diluting the ampoule, led to the health worker receiving 5 doses of the vaccine at once.

Professor Wong Tian Yin, Medical Director of Singapore's National Eye Center, said the center apologized to the injured employee and his family, conducted a comprehensive review of its internal processes, and took steps to tighten them so that such lapses do not recur again.

For its part, the Ministry of Health said that it had worked with the Singapore National Eye Center to identify the vulnerabilities that contributed to the error.

The ministry said clinical trial data from Pfizer-Biontech indicated that receiving more than the recommended dose of the vaccine was unlikely to be harmful.

The Ministry of Health also said that there are strong medical protocols in place at all vaccination sites to ensure the safety of those who received the vaccine.

The Straits Times quoted infectious disease experts it spoke to as saying an overdose was unlikely to be harmful.

A similar case occurred in Germany last year, when eight workers in a nursing home received an overdose of the vaccine and showed no severe harmful effects.

This will not cause the factor to be infected with "Covid-19", but an overdose may lead to an increase in the common side effects of the vaccine, such as fever and aches, said Professor Ui Ang Aung from Duke-NUS College of Medicine.

Some experts also said the employee would still need a second dose of the vaccine.

What is the latest data on the side effects of the Pfizer-Biontec vaccine for Corona?

According to British researchers who studied about 40,000 people who received the Corona vaccination - most of them health care workers - the results are reassuring.

The researchers said on their website that side effects may include:

  • Headache.

  • fever.

  • Chills or shivering.

  • Tired.

  • Muscle or joint pain.

  • diarrhea.

  • Feeling sick.

  • Feeling of pain, swelling, redness, or itching at the injection site.

  • Swollen glands (lymph nodes) in the armpit.

    • The researchers said that although they may make you feel upset, all these effects are a sign that your immune system has begun to work to protect you from "Covid-19".

    Meanwhile, do not worry if you do not experience any of these effects after your vaccination;

    Your immune system will still learn to respond to the virus, it just isn't making a fuss about it.

    What percentage of people have had side effects after receiving the vaccine?

    • About 1 in 7 people who received a single dose;

      They had at least one side effect on the whole body level, called "systemic effects, such as fever and chills," within 7 days of the vaccination.

    • About 4 out of 10 people who received their first dose had at least one local side effect, and the most common effects were pain and swelling a day or two after the injection.

    • Most of the symptoms occur in the first two days after vaccination, the most common of which are headache, fatigue and chills.