Covid-19 Vaccines

COVID-19 vaccines protect people from coronavirus disease. There are four types of vaccines at present. They are categorized as viral vector, nucleic acid (RNA and DNA), whole virus, and protein subunit. Though vaccines offer significant protection against the disease, chances of breakthrough infections are increasing. These vaccines are administered intramuscularly. Pain at the injection site, fever, muscle pain, etc., are its side effects in some people. Pfizer, Moderna, Covaxin, Sputnik, AstraZeneca, Johnson and Johnson's Janssen, Sinopharm, Novavax, Sinovac, etc., are some available approved COVID-19 vaccines.

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All the answers published in this website are written by verified medical doctors, therapists and health experts. The Content has been moderated by iCliniq medical review team before publication. Post your medical clarifications on iCliniq by choosing the right specialty and get them answered. Your medical queries will be answered 24/7 by top doctors from iCliniq.

Is it possible to develop an allergic reaction even after 12 hours of vaccination?

Query: Hello doctor,My brother had a high fever, sweat, difficulty breathing, and dizziness 12 hours after the AstraZeneca vaccine and had to rush to the hospital. Can he get the second dose?  Read Full »

Dr. Jebin Abraham

Answer: Hi, Welcome to Are you sure it is due to the vaccine? Since it is a late-onset reaction, make sure there is no other cause. Did he have any other allergies like drugs or food? If you believe that it was related to the vaccine, do not take a second dose. It may be a late-onset reaction...  Read Full »

Can anaphylactic patients take COVID-19 vaccination?

Query: Hi doctor, My mother had an anaphylactic reaction to Penicillin before. Local doctors have refused her vaccines Covaxin and Sinopharm. She previously had rashes after taking the soluble tablet Efferalgan (Paracetamol). We do not have the Covaxin vaccine anymore in my country, and I want to know if ...  Read Full »

Dr. Jebin Abraham

Answer: Hi, Welcome to It is better to avoid vaccination for her. Though it is not related to vaccine content, anaphylaxis risk is a serious concern. Kindly avoid any vaccine. Do not take second dose. It may cause a severe reaction this time. Any vaccine can have the risk of a reaction. We ca...  Read Full »

Can I get the COVID vaccine as I have a food allergy?

Query: Hello doctor, I am a 48-year-old female. My height is 5'3, and my weight is 119.05 pounds. My symptoms are hives, itchiness, and sleeplessness. I used Zyrtec and Aquasoft moisturizing lotion. After a mosquito bite, hives are formed, and now without mosquito bites, also I had hives and itchiness. I s...  Read Full »

Dr. Jebin Abraham

Answer: Hello, Welcome to Thanks for contacting us. Hives can be triggered by a variety of insults. A detailed history and check-up will be needed to find out the exact cause of the same. Apart from mosquito bites, food, clothes, other insects, etc., can cause hives. Some medicines can also c...  Read Full »

Does a second dose of the Pfizer COVID vaccine increase lung inflammation?

Query: Hello doctor, I was tested positive for COVID five weeks ago. And by the third week, I was completely cured without any symptoms. But now, I have inflammation in my lungs. I consulted a doctor and took a chest x-ray; I was diagnosed with bronchitis. I received the first Pfizer vaccine after I re...  Read Full »

Dr. Muhammad Zubayer Alam

Answer: Hi, Welcome to Thank you for the query. I can understand your concern. According to your statement, you have been suffering from persistent dyspnea. You have been tested positive for COVID-19 (Coronavirus Disease-2019) five weeks ago. Your chest x-ray shows peribronchial cuffing with...  Read Full »

Why is my arm sore after getting the COVID vaccine?

Query: Hi doctor,It has been 12 days since the second dose of Covaxin vaccination, and I have pain extending from arm to neck. Why is this, and what to do? Please help me.  Read Full »

Dr. Muhammad Zubayer Alam

Answer: Hi, Welcome to Thank you for the query. I can understand your concern. According to your statement, you have been suffering from pain that radiates from arm to neck. Arm pain is a common side effect of the COVID vaccine. Some may have soreness, and others may have shooting pain like ...  Read Full »

What is the expected level of antibodies after a COVID vaccine?

Query: Hi doctor, I did the antibody test after two doses of the AstraZeneca vaccine at a gap of 5.5 weeks. The second dose was before 6 weeks. I want to get my report evaluated. What is the range for antibodies? Thank you.  Read Full »

Dr. Mohammad Rajja

Answer: Hello, Welcome to You have an antibody IgG (immunoglobulin G) value of 13.52 U/mL, which means you have enough antibodies to fight COVID. Now you are protected from COVID. Check again after five months and get the third shot after getting antibody reports. As of now, you do not need...  Read Full »

Can I take the Hepatitis B vaccine along with the COVID vaccine?

Query: Hi doctor, I have to take a Hepatitis B vaccine for traveling abroad. I also have a slot booked for the Covishield vaccine. Is it fine to take the Hepatitis B vaccine if I take the COVID-19 vaccine? What is the duration of the gap between these two vaccines?  Read Full »

Dr. Muhammad Zubayer Alam

Answer: Hi, Welcome to Thank you for the query. I can understand your concern. According to your statement, you have to take the Hepatitis B vaccine for traveling abroad. You also have to take the Covishield vaccine for the COVID-19 virus too. There is no evidence to suggest that the COVID-1...  Read Full »

Do increased antibodies after COVID-19 vaccine cause any side effect?

Query: Hi doctor, I had Coronavirus last year. Last month I got the first shot of the Sputnik V vaccine, and after three weeks of the shot, I checked my antibodies, and the number was 3270 (I am not wrong about this). When I went for a re-vaccine, I asked if it was necessary, but the doctor there told me...  Read Full »

Dr. Pawar Satyajit Jalinder

Answer: Hi, Welcome to I have gone through your query and can understand your concern. Sputnik V is a two-part vaccine with a design to augment the response achieved with the first dose. The addition of a second dose will help maintain that response, which is why Sputnik has one of the highes...  Read Full »

Is the efficacy higher if the gap between two COVID shots is increased?

Query: Hi doctor, I heard that the second dose of AstraZeneca vaccine taken 12 to 16 weeks apart gives an efficacy of 90%. In contrast, four to six weeks offers only 79%. But one remains exposed to the virus for three months with 40 to 50% higher risk than with 4 to 6% as only one dose gives protection of...  Read Full »

Dr. Shubadeep Debabrata Sinha

Answer: Hi, Welcome to I will go by what is approved. The gap between the first and second dose is four weeks for most vaccines except Sputnik, where it is 21 days. Studies have concluded that increasing the gap to six to eight weeks between the first and second dose increases antibody prod...  Read Full »

Is it normal to get chills and fever after vaccination?

Query: Hi doctor, I got vaccinated yesterday morning, and in the evening, I got chills and fever, and today whole body is tired. I am also a diabetic patient. Can you please tell me what to do and what to eat?  Read Full »

Dr. Padmapriya Kallingiam Vasudevan

Answer: Hi, Welcome to I am glad you got your shot. Do not worry. It is a normal immune response to feel slight tiredness and have a slight fever and body ache. 1) Please go ahead and take tablet Tylenol 500 mg (Acetaminophen) every six hours as needed for your body ache and fever. 2) Drink...  Read Full »

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