These are the vaccines that can be scientifically mixed

In our 300th episode, Dr. Elmer Huerta answers several questions from our audience about the covid-19 vaccine, the possibility of mixing doses from different pharmaceuticals, and what we can or cannot do before and after getting vaccinated.

You can listen to this episode on Spotify or your favorite podcast platform or read the transcript below.

Hello, I am Dr. Elmer Huerta and this is your daily information on the new coronavirus. Information that we hope will be useful to take care of your health and that of your family.

Questions about the covid-19 vaccine

Dozens of listeners ask the same question: can you mix different types of vaccines? For example, some say they were vaccinated with Sinovac, Sinopharm, or the Russian vaccine and have the opportunity to be vaccinated with Pfizer or Moderna.

We say to all of them that the only studies that have investigated the combination of vaccines have been those of AstraZeneca and Pfizer. Those two vaccines can be combined.

On the other hand, it has also been determined that Moderna and Pfizer vaccines are interchangeable, that is, you can start with one and end with the other.

Since the interchangeability of the other vaccines has not been studied, whoever does so must do so at their own risk.

Hello Maria, the usual thing is that it is at 4 weeks, although – as we heard in the episode of May 17 – in countries like the United Kingdom, the second dose can be extended up to 12 weeks.

Good question Saúl, unfortunately we still don’t know the answer to your question. We must await the follow-up results of the phase 3 studies and determine how long the vaccines provide protection.

Hi Luis, that doesn’t seem like proper advice to me. You have already received a dose and you should only complete your vaccination with the missing dose, not start over.

Hi César, I don’t think you should be vaccinated without consulting the officials of the study in which you are participating. It is possible that they will allow you to open the blind and know if they gave you a vaccine or a placebo, and therefore know whether to vaccinate or not.

Hello Salvador, the use of a third dose of the vaccines is in full study. I suggest you listen to the episode of May 24 to know the details.

That’s a good question Sapphire, I suggest you listen to the March 22 episode where you will hear about a study suggesting that a single dose of Pfizer / BioNTech vaccine would be sufficient in a person who has already had the disease.

Very good question Ciro. For phase 3 studies, the interval between AstraZeneca doses should be 4 weeks and between Pfizer / BioNTech doses, 3 weeks. However, as you can hear in the May 17 episode, the UK applies the second dose of those vaccines up to 12 weeks after the first.

Hello Fer, the possibility of developing a clot is very rare, estimating that it is five cases for every million people who receive the vaccine.

Excellent question Josué, as we heard in the May 27 episode, no vaccine is 100% effective. In an evaluation by the United States CDC, in 101 million people vaccinated, there were 10,262 cases of covid-19, of which 2,725 were asymptomatic, 995 were hospitalized and 160 died. The median age of the patients who died was 82 years.

Questions about the contagion of covid-19

Hello Zacarías, the most practical thing is that you isolate yourself for 10 days and wait until you have any symptoms, which generally occur around the sixth day of the first contact, and take the test at that time. If you do not have symptoms during those days, there is no danger.

Hi Ana, that’s normal. On about day 7 of infection, the defense system begins to produce antibodies or immunoglobulins G, which can already be found in the blood.

Very good question Luis. The exact type of disease caused by the variants is not yet known. This is a very active area of ​​research, remember that the variants of clinical significance have only just begun to be known since December 2020.

Very good question Eduardo. A person who has finished his period of isolation is supposed to be able to reunite with relatives who live in the same house because he is no longer capable of transmitting the disease. No need to take additional measures.

Questions about the covid-19 vaccine, other diseases and what can or cannot be done after inoculation

Hello Mariela, so far, it has only been shown that people who take a drug called methotrexate, may have a lower activity of the vaccine. Anyway, according to the European Medicines Agency and the World Health Organization, ivermectin is not capable of preventing covid-19 and, when in doubt that this medicine can affect the vaccine, it is better not to. consume.

Hi Hippie, of course I do. The vaccine does not cause any problems with the ability to have sex. But a different thing is that you trust yourself and thinking that you are already protected with a single dose, you have sex with an infected partner and you get infected. This is because the vaccine does not provide complete protection until the two doses are completed.

Hello Cafadarwer, first of all I congratulate you on protecting yourself against cervical cancer by getting vaccinated against the human papillomavirus. We recommend waiting two weeks after having the HPV vaccine to get the covid-19 vaccine.

Hello Laura, that is not true, a person can be vaccinated against influenza and receive covid-19 or vice versa.

Because the vaccine in adolescents under 16 has only recently been used, that data is still unknown. If you want to know about the possible relationship between myocarditis and messenger RNA vaccines, I suggest you listen to the May 25 episode.

Hello Diana, neither are conditions that prevent you from getting vaccinated against covid-19.

Hello Juan José, the only antecedent of concern is the fact that your mother had an allergy after an injection. You should speak with your personal physician and determine if the Pfizer and Moderna vaccines would not be recommended.

Hi Al, that point has not yet been studied. My suggestion is that you keep taking care of yourself until you get the second dose of the vaccine and even after that, you need to be careful.

Do you have questions about the coronavirus?

Send me your questions on Twitter, we will try to answer them in our next episodes. You can find me at @DrHuerta.

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