
Muscle infections are rare due to the relative resistance of muscles to infection. However, bacterial, fungal, parasitic, and viral infections can cause myositis, a group of rare conditions that cause muscle inflammation. Myositis can be caused by viruses such as HIV, influenza, and the common cold and flu viruses, and less commonly by bacteria, fungi, or other organisms. Pyomyositis, a rare bacterial infection of the skeletal muscle, is another example of a muscle infection. It usually occurs in the presence of muscle injury, surgery, ischemia, or a foreign body.
| Characteristics | Values |
|---|---|
| Muscle infections are rare because | Muscles have a relative resistance to infection |
| Types of muscle infections | Myositis, Pyomyositis, Clostridial myositis, Parasitic myositis, Fungal myositis, Viral myositis, Rickettsial myositis, Borreliacan myositis, Mycobacterial myositis, Cryptococcal myositis, Candida myositis, Histoplasma myositis, Coccidioides myositis, Aspergillus myositis |
| Myositis causes | Inflammatory conditions, Infection, Drugs |
| Myositis symptoms | Muscle weakness, pain, swelling, fever, fatigue, stiffness, difficulty in swallowing, talking, breathing |
| Myositis treatment | Drugs that suppress the immune system, Antibiotics, Stopping the medication |
| Pyomyositis causes | Bacterial infection, Muscle injury, Muscular trauma, Vigorous exercise, Surgery, Ischemia, Presence of a foreign body, Immunocompromising conditions |
| Pyomyositis symptoms | Pain, Tenderness, Fever, Abscess formation, Swelling, Limping |
| Pyomyositis treatment | Antibiotics, Incision, Debridement, Muscle drainage, Aspiration, Biopsy |
| Clostridial myositis causes | Traumatic wounds with soil contamination, Compound fracture, Penetrating wounds, Gastrointestinal (GI) surgery, Septic abortions, Parenteral drug abuse, Peripheral arterial disease of limbs, Devitalized tissue, Foreign body |
| Parasitic myositis causes | Trichinosis, Cystericercosis, Protozoa, Helminths, Travel history, Presence of eosinophilia |
| Fungal myositis causes | Immunocompromised hosts, Severe neutropenia, Extensive use of broad-spectrum antibiotics, Immunosuppressive drugs |
| Fungal myositis symptoms | Tenderness, Fever, Rash, Microabscesses, Larger abscesses |
| Fungal myositis treatment | Antifungal drugs, Surgical debridement |
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What You'll Learn
- Muscle tissue is resistant to infection
- Muscle infections are often caused by trauma, surgery, or foreign bodies
- Muscle infections are usually caused by viruses, which don't require treatment
- Bacterial muscle infections are uncommon and require antibiotics
- Myositis, an inflammatory muscle condition, is rare

Muscle tissue is resistant to infection
Muscle tissue is generally resistant to infection. However, muscle infections can occur and are known as myositis. Myositis is an inflammatory condition that causes muscle weakness, pain, and swelling. It is an autoimmune disease where the body's immune system mistakenly attacks its own muscles. Polymyositis is a type of myositis that affects multiple muscles simultaneously, especially those near the body's core, such as the arms, hips, thighs, chest, back, neck, and abdomen. It can also cause difficulty in swallowing, talking, or breathing.
Infectious myositis is uncommon due to the relative resistance of muscle tissue to infection. However, certain inciting events can make muscle tissue more susceptible to infection, including trauma, surgery, ischemia, or the presence of foreign bodies or devitalized tissue. Bacterial myositis, also known as pyomyositis, is a rare bacterial infection that can cause abscesses in the muscles. It is usually seen in individuals with muscular injury, surgery, or immunocompromising conditions. Pyomyositis is characterized by pain, tenderness, fever, and abscess formation in the affected muscles.
Viral infections are the most common infectious cause of myositis. Viruses can attack muscle tissue directly or release substances that damage muscle fibers. Examples of viruses that can cause myositis include the common cold and flu viruses, as well as HIV. Fungal myositis is also rare and usually occurs in immunocompromised individuals. Candida species are the most common fungal microbes causing myositis and are often part of a systemic infection associated with severe neutropenia, extensive use of broad-spectrum antibiotics, and immunosuppressive drugs.
Parasitic myositis is another form of infectious myositis, most commonly caused by trichinosis or cystericercosis. The occurrence of parasitic myositis depends on geographic location, with cases being rare in the United States. Rickettsia, Borrelia, and Legionella bacteria can cause localized myositis. Mycobacterial species can also cause myositis, although it is less common compared to other tissues in the body. Clostridial myositis, also known as gas gangrene, is caused by Clostridial perfringens and is commonly associated with traumatic wounds, compound fractures, penetrating wounds, gastrointestinal surgery, or the presence of foreign bodies containing Clostridial spores.
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Muscle infections are often caused by trauma, surgery, or foreign bodies
Muscle infections, or myositis, are uncommon due to the relative resistance of muscles to infection. However, bacterial myositis can occur in the context of muscular injury, surgery, ischemia, or the presence of foreign bodies.
Infectious myositis is usually caused by bacterial, fungal, parasitic, or viral agents. Trauma, surgery, and foreign bodies are often present in cases of bacterial myositis. For instance, clostridial myonecrosis, or gas gangrene, can occur in traumatic wounds with soil contamination, surgery involving the bowel, or the presence of foreign bodies. The risk of infection is heightened in immunocompromised individuals.
Surgical site infections (SSIs) are a type of infection that occurs on the part of the body where surgery took place, affecting 1% to 3% of surgical patients. They are typically caused by microbial contamination of the wound and can be classified as superficial incisional, deep incisional, or organ or space infections. Organ or space SSIs are associated with higher morbidity and mortality rates.
Foreign bodies can also cause infection in muscle tissue. Vacuum-assisted wound therapy has been used successfully to treat wounds after major trauma, orthopedic procedures, burn surgeries, and open abdominal wounds, reducing the risk of surgical site infections and postoperative complications.
Infectious or post-infectious reactive myositis can occur during or after viral infections, such as HIV, or as a result of drug treatments. Myositis can cause muscle cells to die rapidly, leading to severe weakness and difficulty with movement. It can also affect breathing and swallowing, and in rare cases, it may cause heart weakening.
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Muscle infections are usually caused by viruses, which don't require treatment
Muscle infections, or myositis, are uncommon due to the relative resistance of muscles to infection. When caused by viruses, they do not usually require specific treatment. Myositis is an autoimmune disease that causes the immune system to attack muscles. It usually affects several muscles simultaneously, particularly those near the body's center, such as the arms, hips, thighs, chest, back, neck, and abdomen. The condition leads to muscle weakness, pain, and swelling, and can make it difficult to swallow, talk, or breathe.
Myositis has several types, including polymyositis and dermatomyositis. Polymyositis affects multiple muscles and rarely other parts of the body. Dermatomyositis causes similar symptoms but also includes a skin rash. Myositis can also affect muscles responsible for vital functions like breathing and swallowing. In rare cases, it may weaken the heart, leading to long-term breathlessness. Children with dermatomyositis may develop painful calcium deposits in damaged muscles, resulting in permanently rigid joints called contractures.
Myositis is often caused by viral infections, which are the most common infectious cause. Viruses can attack muscle tissue directly or release substances that damage muscle fibers. Examples include common cold and flu viruses, as well as HIV. While viral myositis usually doesn't require specific treatment, it can cause long-term complications in rare cases, such as long-term viral muscle infections in people with HIV. Additionally, antiviral medications like neuraminidase inhibitors can be useful for reducing the duration of respiratory and systemic symptoms if administered early. However, the efficacy of antiviral treatment for acute benign myositis is unknown and not currently recommended.
In contrast, bacterial myositis is less common and often occurs due to muscular injury, surgery, ischemia, or the presence of foreign bodies. Pyomyositis, a type of bacterial myositis, can cause abscesses in the muscles, leading to pain, swelling, and fever. Bacterial myositis is typically treated with antibiotics, and severe cases may require surgery. Fungal myositis is rare and usually affects immunocompromised individuals, while parasitic myositis is often associated with travel history and the presence of eosinophilia.
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Bacterial muscle infections are uncommon and require antibiotics
Muscle infections are rare due to the relative resistance of the musculature to infection. Myositis, for example, is a rare condition that causes muscle inflammation, leading to weakness, pain, and swelling. It can be caused by various factors, including injury, autoimmune conditions, or drug side effects, but bacterial infections are uncommon.
Bacterial myositis, or infectious myositis, is uncommon due to the musculature's resistance to infection. However, it can occur in the presence of muscular injury, surgery, ischemia, foreign bodies, or immunocompromising conditions. Certain bacterial infections, such as Staphylococcus aureus, are more commonly associated with myositis, especially in the tropics.
When bacterial myositis does occur, it can have serious consequences. For example, pyomyositis is a bacterial infection of skeletal muscle that can progress to an intramuscular abscess. Early diagnosis and treatment are crucial, as abscesses may require percutaneous or open surgical drainage in addition to antibiotic therapy.
The treatment for bacterial myositis typically involves intravenous antibiotics for the first 1-2 weeks, followed by oral antibiotics for a total of 4-6 weeks. In some cases, longer durations or broader antibiotic coverage may be necessary. The specific antibiotic chosen depends on the infecting organism and the patient's immune status. For instance, penicillin is the drug of choice for streptococcal infections, while cloxacillin is preferred for Staphylococcus aureus.
In summary, bacterial muscle infections are uncommon due to the musculature's inherent resistance to infection. However, when they do occur, they can have serious consequences and require prompt diagnosis and treatment. Antibiotic therapy plays a crucial role in managing bacterial myositis, along with surgical intervention in more severe cases.
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Myositis, an inflammatory muscle condition, is rare
Myositis is a rare inflammatory muscle condition that causes muscle inflammation, leading to weakness, pain, and swelling. It is an autoimmune disease, meaning the body's immune system mistakenly attacks its own healthy tissues and muscles. This can result in injured or destroyed muscle fibres, affecting muscle function and causing fatigue. Myositis can affect people of any age, including children, and impacts various muscles in the body, including those around the shoulders, hips, thighs, arms, abdomen, neck, chest, and back.
Infectious myositis is uncommon due to the relative resistance of muscles to infection. However, bacterial myositis can occur following muscular injury, surgery, ischemia, or the presence of foreign bodies. Viral infections are the most common infectious cause of myositis, while bacterial, fungal, and parasitic causes are less frequent. Certain medications can also induce myositis by causing temporary muscle damage.
There are several types of myositis, including polymyositis, dermatomyositis, and inclusion body myositis, each with distinct symptoms and affected muscle groups. Polymyositis affects multiple muscles simultaneously and can cause muscle weakness, pain, fever, fatigue, and stiffness. Dermatomyositis causes similar symptoms but also includes a skin rash. Inclusion body myositis may result in a different pattern of weakness, with patients reporting difficulties in using their hands.
Diagnosing myositis can be challenging due to the varied presentation of symptoms. A muscle biopsy is considered the gold standard for diagnosis, as it can reveal inflammatory changes and rule out other causes of muscle injury. While there is no cure for myositis, treatments aim to manage symptoms through medication and physical therapy. Patients may also benefit from dietary changes, such as adopting an anti-inflammatory diet like the Mediterranean diet.
Myositis is a rare condition, with an estimated 7,000 new diagnoses each year in the United States. It is more prevalent in people between the ages of 45 and 64, affecting 8 to 10 out of every 100,000 people in this age group annually. Polymyositis, a specific type of myositis, is even rarer, affecting fewer than 25 out of 100,000 people annually.
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Frequently asked questions
Muscle infections are rare due to the relative resistance of the musculature to infection. However, muscle infections can occur and are known as myositis. Myositis is the name for a group of rare conditions that can cause muscles to become weak, tired and painful.
Myositis can be caused by inflammation throughout the body, autoimmune conditions, viral or bacterial infections, certain medications, and in rare cases, statin medication.
Symptoms of myositis include muscle weakness, pain, and swelling. In more severe cases, myositis can affect breathing and swallowing.










































