Udayavni Special

EXPLAINER: Allergic reactions to vaccines rare, short-lived


PTI, Dec 10, 2020, 8:55 AM IST

London: Vaccines can sometimes cause allergic reactions, but they are usually rare and short-lived.
British regulators are looking into reports of allergic reactions in two people who received the new Pfizer COVID-19 vaccine Tuesday, the first day of a vaccination programme. In the meantime, they”re telling people to skip the vaccine if they”ve had a history of serious allergic reactions.

A look at allergic reactions to vaccines:

HOW OFTEN DO THEY HAPPEN?

Allergic reactions can occur with numerous vaccines and experts say they are not unexpected.

In the Pfizer-BioNTech study of 42,000 people, the rate was about the same in those who got the coronavirus vaccine versus those who got a dummy shot. US Food and Drug Administration reviewers who examined the study”s safety data found that 137 — or 0.63% — of vaccine recipients reported symptoms suggestive of an allergic reaction, compared to 111 — or 0.51% — in the placebo group.

A 2015 study in the US examining the rate of anaphylaxis — a severe, life-threatening allergic reaction — found that it occurred about once per every million vaccine doses. The study evaluated children and adults who got vaccines against numerous diseases, including polio, measles and meningitis.

“For the general population this does not mean that they would need to be anxious about receiving the vaccination,” said Stephen Evans, a vaccines expert at the London School of Hygiene and Tropical Medicine.

He noted that even common foods can provoke severe allergic reactions.

WHY DO THESE REACTIONS HAPPEN?

Scientists say people can be sensitive to components in the shot, like gelatin or egg protein, or to the vaccine itself. People with egg allergies are sometimes advised not to get the flu shot, since that vaccine is mostly grown in chicken eggs. Common symptoms of an allergic reaction include a rash, skin irritation, coughing or trouble breathing.

The exact ingredients used in Pfizer”s new COVID-19 vaccine are proprietary and are not publicly disclosed. The vaccine uses a new technology, and is coated in lipid nanoparticles, which have been used in drugs.

WHAT ARE OTHER SIDE EFFECTS?

Typical side effects for many vaccines include things like a sore arm from the shot, fever and muscle aches. In the Pfizer study, participants also reported fatigue, headache and chills.

More serious side effects are reported to regulators or health officials for further investigation. But it can often take time to determine if the vaccine caused the side effect or if the person just coincidentally received the shot before becoming ill.

Udayavani is now on Telegram. Click here to join our channel and stay updated with the latest news.

Top News

This time too Aero India will be successful: Rajnath Singh at B’luru

Will not belie people’s expectations says MLA Angara

Govt-farmer meeting ends; Next round on Jan 19

RAF’s 97 Bn HQ’s stone laying at Shivamogga dist on Jan 16

Famous Bengaluru biker dies after crashing into camel in Jaisalmer

Mohammed Siraj abused by Gabba crowd, called ‘grub’: Report

PM doesn’t respect farmers, wants to tire out those protesting against agri laws: Rahul


Related Articles More

Nepal approves AstraZeneca’s India-made COVID-19 vaccine for emergency use

It will take 6-7 months for vaccine to reach general public, says Maharashtra govt offical

Past Covid-19 infection gives 5-month immunity, but risk exists: UK study

Promising new antibodies from Llamas, Alpacas could help in fight against Covid-19

K’taka COVID-19 update: 751 new cases, 1183 discharges, 5 deaths on Jan 11

MUST WATCH

Mangaluru: SDPI organises ‘SP kacheri chalo’ rally; called off after meeting with ComPol

COVID-19 Vaccine distribution in DK district’s 6 centres from tomorrow: DC Rajendra

Cabinet expansion unhappiness: No need to stand on road and whine says Nalin Kateel

Karkala : Success story of self employed woman Radhika Nayak | Inspirational Stories| Udayavani

Tempo-lorry collide near Dharwad bypass; more than 10 dead | Udayavani

Latest Additions

This time too Aero India will be successful: Rajnath Singh at B’luru

Nepal approves AstraZeneca’s India-made COVID-19 vaccine for emergency use

Economy likely to contract up to 7.5% this fiscal, may See 9-11% growth in FY22: Arvind Virmani

Congress had promised similar farm laws, its leaders laugh at Rahul Gandhi’s remarks: Tomar

India, Japan ink pact to enhance cooperation in ICT

Thanks for visiting Udayavani

You seem to have an Ad Blocker on.
To continue reading, please turn it off or whitelist Udayavani.