Dominic Stone
Vaccines are typically administered through intramuscular injections, which deliver medicine directly into the muscle. This is because vaccines are designed to travel through muscle tissue, which has a greater blood supply than tissues under the skin, allowing the body to absorb drugs faster. However, in rare cases, a vaccine injection may miss the intended muscle, leading to potential complications. This scenario is often referred to as shoulder injury related to vaccine administration (SIRVA). If the injection is too shallow or too deep, it can cause muscle damage, bruising, bleeding, or infection. Incorrectly administered intramuscular injections can also lead to severe complications if the needle penetrates an artery, hits a nerve, or reaches the bone. In such cases, individuals may experience pain, discomfort, and other adverse effects, and it is recommended to seek immediate medical attention.
| Characteristics | Values |
|---|---|
| Muscle targeted by vaccine | deltoid (shoulder) muscle |
| Effect of missing the muscle | Pain, bruising, swelling, infection, shoulder injury (SIRVA) |
| Effectiveness of vaccine | Unknown, but may be less effective |
| Action to take if missed during first shot | Get the second dose at the correct interval |
| Action to take if missed during second shot | Consult a doctor |
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What You'll Learn
- It's unlikely that the COVID-19 vaccine misses the muscle
- People with smaller shoulder muscles are at a higher risk of SIRVA (Shoulder Injury Related to Vaccine Administration)
- Obesity increases the risk of SIRVA
- If the first shot misses the muscle, get the second dose as planned
- Missed muscle injections can lead to pain, bruising, swelling, and infection
It's unlikely that the COVID-19 vaccine misses the muscle
It is highly unlikely that the COVID-19 vaccine misses the muscle. However, it is not impossible, and it is important to be vigilant about any side effects or reactions that may occur.
The COVID-19 vaccine is designed to be injected into the deltoid muscle, located in the shoulder. This muscle is usually easily accessible, and it is difficult for the vaccine provider to miss it. However, people with higher BMIs may need longer needles to ensure the vaccine reaches the muscle. If you have a high BMI, it is important to inform your vaccine provider so they can take the necessary steps to ensure the vaccine is injected correctly.
If the vaccine is injected into the fat instead of the muscle, it is still effective, but the level of protection against COVID-19 may be lower. The Centers for Disease Control and Prevention (CDC) does not recommend repeating the same dose if this happens. If the error occurred during the first shot of a two-dose vaccine, you should still get the second dose as scheduled.
To ensure the vaccine is injected correctly, wear clothing that easily exposes your shoulder. If you experience any side effects or reactions, report them to your doctor. Some common side effects of the COVID-19 vaccine include pain, redness, or swelling at the injection site, fatigue, headache, muscle aches, chills, joint aches, and fever. These side effects typically go away within a few days.
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People with smaller shoulder muscles are at a higher risk of SIRVA (Shoulder Injury Related to Vaccine Administration)
SIRVA, or Shoulder Injury Related to Vaccine Administration, is a rare but recognised complication of immunisation. It is believed to be caused by improper vaccine administration rather than the vaccine itself. SIRVA is characterised by severe shoulder pain and a reduced range of motion within 48 hours of vaccination, with symptoms lasting for weeks or months.
People with smaller shoulder muscles are at a higher risk of SIRVA because the deltoid muscle, where the vaccine is injected, is smaller and harder to locate. If the shot is injected too high in the arm, the vaccine can be delivered to the shoulder joint capsule instead of the deltoid muscle, causing inflammation, pain, and decreased range of motion. This can damage the tendons, ligaments, and bursae in the shoulder. In rare cases, nerves in the upper arm can be injured.
To prevent SIRVA, it is important that vaccines are administered correctly. Medical workers are trained to locate the middle, thickest part of the deltoid muscle before administering the shot. For people with smaller shoulder muscles, it may be necessary to use a longer needle to reach the muscle.
If you experience symptoms of SIRVA after receiving a vaccine, you should consult your doctor. Treatment options may include local treatments, physiotherapy, or surgery in severe cases. It is important to note that SIRVA is a rare complication and should not deter people from getting vaccinated.
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Obesity increases the risk of SIRVA
While it is unlikely that a vaccine injection would miss the muscle, it is possible, especially for people with obesity or high body mass indexes (BMIs). Obesity is defined by a BMI of 30 or higher, and a higher BMI is associated with a greater risk of developing obesity-related health problems. People with obesity may need longer needles to ensure that the vaccine is injected into the muscle.
Obesity increases the risk of developing serious health conditions, including heart disease, stroke, and kidney disease. This is because obesity can lead to high blood pressure, high cholesterol, and high blood glucose levels, all of which are risk factors for heart disease and stroke. Obesity can also cause breathing problems, such as asthma and sleep apnea, joint problems, gallstones, and gallbladder disease.
Additionally, obesity has been linked to an increased risk of developing certain types of cancer. For example, men with obesity are more likely to develop cancers of the colon, rectum, and prostate, while women with obesity have a higher risk of breast, uterine, and gallbladder cancers. Obesity can also affect lung function and increase the risk of psychological problems, such as anxiety and depression, as well as social issues like bullying and stigma.
Therefore, obesity can increase the risk of the vaccine missing the muscle, and it is a significant risk factor for developing various health conditions. It is important to ensure that individuals with obesity have access to appropriate healthcare and support to manage their weight and reduce their risk of developing these health problems.
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If the first shot misses the muscle, get the second dose as planned
It is possible for a vaccine injection to miss the muscle. This can happen because different arms have different amounts of fat, and people with higher BMIs may need longer needles to reach the muscle. It is difficult to miss the deltoid muscle, but it can happen. If the first shot of a two-dose vaccine misses the muscle, you should still get the second dose as planned.
The Centers for Disease Control and Prevention (CDC) does not offer much advice on what to do if the vaccine is injected into the fat rather than the muscle. However, they do advise providers not to repeat the same dose of the vaccine. This means that if the first dose misses the muscle, you should still get the second dose as planned, and it will still count. The second dose should be administered at the correct interval—21 days later for Pfizer, and 28 days for Moderna.
If the vaccine misses the muscle, it might lead to pain, bruising, swelling, and infection. This is known as SIRVA (Shoulder Injury Related to Vaccine Administration). SIRVA can occur when a vaccine is injected too high or too low on the shoulder, leading to inflammation and pain in the area. It can be difficult to perform everyday activities such as lifting, carrying, and reaching. It is a rare occurrence, but it can significantly impact a person's quality of life and employment.
If you experience shoulder pain that does not go away after receiving a vaccine, you should tell your doctor that you have received the vaccine so that they have this information when evaluating you. If you experience shoulder, arm, or hand pain, weakness, or a limited range of motion, you should contact your healthcare provider. They will ask about your symptoms and medical history and may perform a physical examination of your shoulder. They may also order imaging tests, such as a CT scan or MRI, to evaluate the structures in your shoulder and determine the cause of your symptoms.
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Missed muscle injections can lead to pain, bruising, swelling, and infection
While it is rare, it is possible for a vaccine injection to miss the muscle. This is more likely to occur in individuals with smaller shoulder muscles or obesity, as these factors can make it more difficult to locate the muscle. If a vaccine injection misses the muscle, it might lead to pain, bruising, swelling, and infection.
Pain and inflammation can be symptoms of a shoulder injury related to vaccine administration (SIRVA). SIRVA is a rare condition that occurs when a vaccine is injected too high or too low on the shoulder, causing inflammation and leading to damage to the nearby structures. If you experience shoulder pain that does not go away after receiving a vaccine, you should inform your doctor and mention that you recently received a vaccine so that they have this information when evaluating you.
People with smaller shoulder muscles may be at an increased risk of SIRVA, as the vaccine may be more likely to miss the muscle and hit the bursae or tendons. Obesity can also increase the risk of SIRVA due to the extra fat tissue in the shoulder, which can make it more challenging to locate the muscle and avoid the surrounding structures. Certain vaccines, such as the flu vaccine, require a longer needle, and improper administration may increase the likelihood of SIRVA.
If you experience shoulder, arm, or hand pain, weakness, or a limited range of motion after receiving a vaccine, it is important to contact your healthcare provider. They will ask about your symptoms and medical history and may perform a physical examination, including imaging tests such as a CT scan or MRI, to evaluate the structures in your shoulder and determine the cause of your symptoms.
While it is not very likely that a vaccine injection would miss the muscle, it is important to be aware of potential side effects or reactions and to report any concerns to your doctor. If you experience complications after a missed muscle injection, you may have legal options, such as filing a claim or seeking compensation through the National Vaccine Injury Compensation Program (VICP).
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Frequently asked questions
A missed muscle injection can cause severe complications, such as muscle damage, bruising, bleeding, infection, and even nerve damage. It may also reduce the effectiveness of the vaccine.
If you think you have received a missed muscle injection, you should seek immediate medical attention. You may also want to contact a vaccine attorney to discuss your legal options, as you may be able to file a lawsuit or qualify for compensation through the National Vaccine Injury Compensation Program (VICP).
It is important to ensure that the person administering the vaccine knows how to choose the proper site on the arm. The Centers for Disease Control and Prevention (CDC), the Immunization Action Coalition (IAC), and the California Department of Health Immunization Program offer resources and tools to help identify the correct spot for administering vaccines.
