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Vaccines are typically administered through injection into the muscle. This is because injecting a vaccine into the layer of subcutaneous fat can cause vaccine failure. For example, in hepatitis B, rabies, and influenza vaccines, subcutaneous injections lead to significantly lower seroconversion rates and more rapid decay of antibody response. In one series of 26,294 adults, of whom 46% had received at least one intramuscular injection, only 48 (0.4%) had a local adverse effect.
| Characteristics | Values |
|---|---|
| Injection technique | Stretching the skin flat before inserting the needle or pinching a fold of skin before injection |
| Needle size | Based on the person's age, the volume of material to be administered, and the size of the muscle |
| Injection site | Based on the person's age, the volume of material to be administered, and the size of the muscle |
| Adverse effects | Serious reactions to intramuscular injections are rare |
| Subcutaneous injections | Can cause abscesses and granulomas |
| Injection into blood vessel | Unlikely to cause an adverse event |
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What You'll Learn
- Injection technique and needle size determine how deep a substance is injected
- Vaccines are injected into muscle to protect from four strains of the meningococcal virus
- Injecting a vaccine into subcutaneous fat can cause vaccine failure
- Serious reactions to intramuscular injections are rare
- Vaccines are unlikely to cause an adverse event if they go into a blood vessel instead of a muscle
Injection technique and needle size determine how deep a substance is injected
The intramuscular route is strongly preferred for vaccines in which the antigen is adsorbed to an aluminium salt adjuvant, such as those for hepatitis A, hepatitis B, and diphtheria, tetanus, and pertussis vaccines. This is because superficial administration leads to an increased incidence of local reactions. In addition, injecting a vaccine into the layer of subcutaneous fat can cause vaccine failure due to poor vascularity, which may result in slow mobilisation and processing of the antigen. For example, subcutaneous injection of the hepatitis B vaccine leads to significantly lower seroconversion rates and more rapid decay of antibody response compared to intramuscular administration.
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Vaccines are injected into muscle to protect from four strains of the meningococcal virus
Vaccines are injected into the muscle to protect from four strains of the meningococcal virus. The meningococcal vaccine is administered through injection into the muscle to protect against four strains of the meningococcal virus that can cause diseases like meningitis or blood infections, such as sepsis. The injection technique and needle size determine how deep a substance is injected. Injection technique involves stretching the skin flat before inserting the needle or pinching a fold of skin before injection, which may necessitate the use of longer needles.
Serious reactions to intramuscular injections are rare. In one series of 26,294 adults, of whom 46% had received at least one intramuscular injection, only 48 (0.4%) had a local adverse effect. Muscle is probably spared the harmful effects of substances injected into it because of its abundant blood supply. In contrast, subcutaneous injections can cause abscesses and granulomas.
The four strains of the meningococcal virus that the vaccine protects against are serogroups B, C, W, and Y. These four serogroups circulate in the United States and are responsible for most meningococcal disease worldwide. The vaccines against these serogroups are known as MenACWY (for serogroups A, C, W, and Y) and MenB (for serogroup B). The MenACWY vaccine is routinely recommended for adolescents and people with other risk factors or underlying medical conditions, such as HIV.
The single best way to prevent meningococcal disease is to be vaccinated. Vaccines are available for people six weeks of age and older. The first dose is typically given at 11 to 12 years of age, and a second dose (booster) is given at 16 years.
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Injecting a vaccine into subcutaneous fat can cause vaccine failure
Vaccines are typically administered through injection into the muscle. This is because injecting a vaccine into the layer of subcutaneous fat can cause vaccine failure. Subcutaneous fat has poor vascularity, which can result in slow mobilisation and processing of the antigen. This can lead to a delay in the immune response.
For example, in hepatitis B, rabies, and influenza vaccines, subcutaneous injection leads to significantly lower seroconversion rates and a more rapid decay of antibody response compared to intramuscular administration. The buttocks, traditionally thought to be an appropriate site for vaccination, do not contain the necessary cells to initiate the immune response.
The thickness of the fat pad above the deltoid muscle of the upper arm varies widely, with women having significantly more subcutaneous fat than men. Therefore, the decision on the size of the needle and injection site should be made individually for each person, taking into account factors such as age, volume of material to be administered, and size of the muscle.
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Serious reactions to intramuscular injections are rare
Vaccines are usually administered through injection into the muscle. This is because injecting a vaccine into the layer of subcutaneous fat can cause vaccine failure. The buttocks, for example, have layers of fat that do not contain the appropriate cells to initiate an immune response.
Intramuscular injections commonly result in pain, redness, and swelling or inflammation around the injection site. These side effects are generally mild and last no more than a few days at most. Rarely, nerves or blood vessels around the injection site can be damaged, resulting in severe pain or paralysis. If proper technique is not followed, intramuscular injections can result in localized infections such as abscesses and gangrene.
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Vaccines are unlikely to cause an adverse event if they go into a blood vessel instead of a muscle
Vaccines are typically administered through injection into the muscle. This is because injecting a vaccine into the layer of subcutaneous fat can cause vaccine failure, as poor vascularity may result in slow mobilisation and processing of the antigen.
Serious reactions to intramuscular injections are rare. In one series of 26,294 adults, of whom 46% had received at least one intramuscular injection, only 48 (0.4%) had a local adverse effect. However, subcutaneous injections can cause abscesses and granulomas. Muscle is probably spared the harmful effects of substances injected into it because of its abundant blood supply.
Having your vaccination go into a blood vessel instead of a muscle is unlikely to cause an adverse event, such as TTS or myocarditis. The Australian Technical Advisory Group on Immunisation (ATAGI) has carefully reviewed the scientific reports and there is no evidence to suggest that there is a link.
However, some people may experience more serious reactions after vaccination. A study in mice found that if an mRNA vaccine gets into a vein, the heart muscle absorbs the mRNA, starts producing coronavirus spike protein, gets attacked by the immune system, and develops inflammation and cell damage (i.e. myocarditis). This is likely what happens in humans, too, if the vaccine accidentally gets injected into a blood vessel instead of muscle cells.
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Frequently asked questions
Injecting a vaccine into the layer of subcutaneous fat can cause vaccine failure. This is because poor vascularity may result in slow mobilisation and processing of the antigen. The muscle is spared the harmful effects of substances injected into it because of its abundant blood supply.
This is unlikely to cause an adverse event, such as TTS or myocarditis.
The injection technique and needle size both determine how deep a substance is injected. To make sure the needle reaches the muscle and that the vaccine does not seep into subcutaneous tissue, the decision on the size of the needle and injection site should be made individually for each person. It should also be based on the person's age, the volume of material to be administered, and the size of the muscle.
The meningococcus vaccine is administered through injection into the muscle to protect from four strains of the meningococcal virus that can cause diseases like meningitis or blood infections, such as sepsis.
