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The Daily Insight

What is a monoclonal antibody used for

Author

Victoria Simmons

Published Apr 22, 2026

Monoclonal antibodies are laboratory-produced molecules that act as substitute antibodies that can restore, enhance or mimic the immune system’s attack on cells. Monoclonal antibodies for COVID-19 may block the virus that causes COVID-19 from attaching to human cells, making it more difficult for the virus to reproduce and cause harm. Monoclonal antibodies may also neutralize a virus.

How many types of monoclonal antibody COVID-19 treatments are there in the US?

In the United States, there are three anti-SARS-CoV-2 monoclonal antibody treatments with FDA Emergency Use Authorization (EUA) for the treatment of COVID-19: bamlanivimab plus etesevimab, casirivimab plus imdevimab,, and sotrovimab.

For which COVID-19 patients has been approved Remdesivir?

On October 22, 2020, the FDA approved the antiviral drug Veklury (remdesivir) for use in adults and pediatric patients (12 years of age and older and weighing at least 40 kg) for the treatment of COVID-19 requiring hospitalization.

How do monoclonal antibodies work against COVID-19?

Monoclonal antibodies for COVID-19 may block the virus that causes COVID-19 from attaching to human cells, making it more difficult for the virus to reproduce and cause harm. Monoclonal antibodies may also neutralize a virus.

Does an antibody test diagnose an active COVID-19?

Antibodies can take several days or weeks to develop after you have an infection and may stay in your blood for several weeks after recovery. Because of this, antibody tests should not be used to diagnose an active coronavirus infection.

Can I get the COVID-19 vaccine if I was treated with monoclonal antibodies or convalescent plasma?

If you were treated for COVID-19 symptoms with monoclonal antibodies or convalescent plasma, you should wait 90 days before getting a COVID-19 vaccine.

Are antibiotics effective in preventing or treating COVID-19?

Antibiotics do not work against viruses; they only work on bacterial infections. Antibiotics do not prevent or treat COVID-19, because COVID-19 is caused by a virus, not bacteria. Some patients with COVID-19 may also develop a bacterial infection, such as pneumonia.

What is Remdesivir?

Remdesivir is in a class of medications called antivirals. It works by stopping the virus from spreading in the body.

What medication is not recommended before vaccinations for COVID-19?

It is not recommended you take over-the-counter medicine – such as ibuprofen, aspirin, or acetaminophen – before vaccination for the purpose of trying to prevent vaccine-related side effects. It is not known how these medications might affect how well the vaccine works.

How can convalescent plasma be used to treat COVID-19?

The blood from people who recover from COVID-19 contains substances called antibodies, which are capable of fighting the virus that causes the illness. For some other diseases caused by respiratory viruses, giving people the liquid portion of blood that contains these antibodies, called plasma, obtained from those who have recovered from the virus, may lead to more rapid improvement of the disease. Patients with COVID-19 may improve faster if they receive plasma from those who have recovered from COVID-19, because it may have the ability to fight the virus that causes COVID-19.

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How does the body develop immunity to COVID-19?

Once you’ve been exposed to a virus, your body makes memory cells. If you’re exposed to that same virus again, these cells recognize it. They tell your immune system to make antibodies against it.

Can you contract COVID-19 through sexual intercourse?

Although there is currently no evidence that the COVID-19 virus transmits through semen or vaginal fluids, it has been detected in the semen of people recovering from COVID-19. We would thus recommend avoiding any close contact, especially very intimate contact like unprotected sex, with someone with active COVID-19 to minimize the risk of transmission

Is Remdesivir approved in Europe for treatment of COVID-19?

Since July 2020, remdesivir has been conditionally approved in Europe for the treatment of coronavirus disease (COVID-19) in adults and adolescents aged 12 years and older with pneumonia who require supplemental oxygen but no invasive ventilation.

How does Remdesivir injection work to treat COVID-19?

Remdesivir is in a class of medications called antivirals. It works by stopping the virus from spreading in the body.

How long can COVID-19 antibodies be detected in blood samples?

Antibodies may be detected in your blood for several months or more after you recover from COVID-19.

What does a positive COVID-19 antibody test result mean?

A positive result means the test did detect antibodies to the virus that causes COVID-19, and it is possible that you had a recent or prior COVID-19 infection and you have developed an adaptive immune response to the virus.

What is the COVID-19 antibody test?

An antibody test looks for antibodies that are made by the immune system in response to a threat, such as a specific virus. Antibodies can help fight infections. Antibodies can take several days or weeks to develop after you have an infection and may stay in your blood for several weeks after recovery. Because of this, antibody tests should not be used to diagnose an active coronavirus infection. At this time, researchers do not know if the presence of antibodies means that you are immune to the coronavirus in the future.

Can you have COVID-19 and still test negative for antibody test?

A negative test means that you have no COVID-19 antibodies, so you probably were not infected with the COVID-19 virus in the past. Because it takes time for antibodies to develop, false-negative test results can happen if the blood sample is collected too soon after your infection started.

Are there different types of COVID-19 diagnostic tests?

There are 2 different types of COVID-19 diagnostic tests — molecular tests and antigen tests. Molecular tests detect the virus that causes COVID-19, SARS-CoV-2. Antigen tests detect specific proteins made by the virus.

Is it safe to take Tylenol or Ibuprofen before a COVID-19 vaccine?

Because of the lack of high-quality studies on taking NSAIDs or Tylenol before getting a vaccine, the CDC and other similar health organizations recommend not taking Advil or Tylenol beforehand.

Should you get the Covid vaccine if you have an autoimmune disease?

The American College of Rheumatology COVID-19 Vaccine Clinical Guidance recommends that people with autoimmune and inflammatory rheumatic disease (which includes lupus) get the vaccine unless they have an allergy to an ingredient in the vaccine.

Can I get the COVID-19 vaccine if I have an underlying condition?

People with underlying medical conditions can receive a COVID-19 vaccine as long as they have not had an immediate or severe allergic reaction to a COVID-19 vaccine or to any of the ingredients in the vaccine. Learn more about vaccination considerations for people with underlying medical conditions. Vaccination is an important consideration for adults of any age with certain underlying medical conditions because they are at increased risk for severe illness from COVID-19.

What pain medication can I take after the COVID-19 vaccine?

The Centers for Disease Control says that you can take over-the-counter pain medicine, such as ibuprofen (like Advil), aspirin, antihistamines or acetaminophen (like Tylenol), if you have side effects after getting vaccinated for Covid. As with any medication, the CDC recommends talking to your doctor first.

For which COVID-19 patients has been approved Remdesivir?

On October 22, 2020, the FDA approved the antiviral drug Veklury (remdesivir) for use in adults and pediatric patients (12 years of age and older and weighing at least 40 kg) for the treatment of COVID-19 requiring hospitalization.

In which COVID-19 cases is remdesivir used?

The FDA has approved the antiviral drug remdesivir (Veklury) to treat COVID-19 in hospitalized adults and children who are age 12 and older in the hospital.