Causes
Staphylococcal infections are caused by Staphylococcus bacteria, most commonly Staphylococcus aureus. These bacteria frequently colonize the skin and nose of healthy individuals without causing harm. Infection occurs when the bacteria enter the body through a break in the skin, such as a cut, scrape, bug bite, or surgical wound. In cases of food poisoning, the illness is caused by toxins produced by the bacteria in contaminated food rather than the bacteria growing inside the body.

Risk Factors
While anyone can develop a staph infection, certain factors increase susceptibility. Common risk factors include staying in a hospital or long-term care facility, having a medical device inside the body (such as a urinary catheter, feeding tube, or artificial joint), and undergoing kidney dialysis. Individuals with weakened immune systems due to conditions like diabetes, cancer, or HIV are at higher risk. Contact sports that involve skin-to-skin contact or shared equipment also increase the likelihood of transmission. Chronic skin conditions like eczema may provide entry points for the bacteria.

Prevention
Primary prevention focuses on hygiene and reducing the spread of bacteria. Effective strategies include washing hands thoroughly and frequently with soap and water, keeping wounds covered with clean and dry bandages until they heal, and avoiding the sharing of personal items like razors, towels, and athletic equipment. Food safety practices, such as keeping hot foods hot and cold foods cold, help prevent staphylococcal food poisoning. To reduce the risk of toxic shock syndrome, tampons should be changed frequently. There is currently no vaccine available to prevent staph infections.

Signs and Symptoms
Symptoms vary significantly depending on the location and severity of the infection. Skin infections, the most common type, typically present as a pimple or boil that is red, swollen, and painful. The area may feel warm to the touch and develop pus or other drainage. Impetigo causes painful rashes or blisters that form a honey-colored crust. Invasive infections affecting the body internally cause systemic symptoms, which may include fever, chills, low blood pressure, and confusion. Staph pneumonia can cause coughing and shortness of breath, while bacteremia (infection of the bloodstream) can lead to joint pain and persistent fever. Food poisoning symptoms appear quickly and include nausea, vomiting, diarrhea, and stomach cramps.

Diagnosis
Clinicians diagnose staphylococcal infections by examining the skin and reviewing symptoms. To confirm the diagnosis and identify the specific strain of bacteria, doctors often collect a tissue sample or swap from the infected wound. If an internal infection is suspected, blood tests, urine tests, or imaging studies such as echocardiograms (for heart issues) or CT scans may be ordered. These tests help differentiate staph infections from other bacterial or fungal infections and determine if the bacteria are resistant to certain antibiotics, such as in the case of Methicillin-resistant Staphylococcus aureus (MRSA).

Treatment Options
Treatment depends on the type and severity of the infection. Minor skin infections are often treated with topical antibiotic creams or oral antibiotics. If an abscess or boil has formed, a healthcare provider may perform a minor procedure to make an incision and drain the pus; this should only be done by a professional to avoid spreading the infection. For more serious or invasive infections, intravenous (IV) antibiotics may be administered in a hospital setting. If the infection involves an implanted medical device, surgical removal of the device may be necessary. Antibiotic resistance is a significant factor in treatment; if tests confirm MRSA, specialized antibiotics that are effective against resistant strains will be prescribed.

When to See a Doctor
Medical care should be sought if an area of red, irritated, or painful skin does not improve or begins to spread. Immediate attention is needed if the skin infection is accompanied by a fever or if the area feels hot and is filled with pus. Emergency care is required for symptoms of sepsis or toxic shock syndrome, such as high fever, confusion, difficulty breathing, or a sudden drop in blood pressure. Routine follow-up is important to ensure the infection has cleared completely and has not returned.

Severity
Staphylococcal infections range from mild, superficial skin irritations to severe, life-threatening systemic diseases. Most infections remain localized to the skin and are considered mild to moderate. However, if the bacteria enter the bloodstream, the condition can progress to severe forms such as sepsis, endocarditis (infection of the heart valves), or osteomyelitis (bone infection). The presence of antibiotic-resistant strains like MRSA increases the severity by limiting treatment options and potentially prolonging the course of the disease.

Prognosis and Complications
The prognosis for treated skin infections is generally very good, with most individuals recovering fully within a short period. Systemic infections carry a more guarded prognosis and depend on how quickly antibiotics are administered. Possible complications include the spread of infection to deep tissues, organ failure, and in rare cases, death. Long-term effects can include recurring skin infections or permanent damage to organs such as the heart or joints if the infection was invasive. Early diagnosis and appropriate antibiotic therapy are the most critical factors in preventing progression and ensuring a positive outcome.

Impact on Daily Activities
For minor infections, impact on daily life is minimal, often requiring only simple wound care and hygiene adjustments. Patients may need to cover wounds while at work or school to prevent transmission. Contact sports or swimming may need to be paused until the infection heals. Those with recurrent infections or chronic issues may experience stress or anxiety regarding transmission and health maintenance. Recovery from severe systemic infections may require a prolonged period of rest, physical therapy, or absence from work.

Questions to Ask Your Healthcare Provider

• Is this infection contagious to my family or coworkers?
• How do I properly clean and bandage the wound at home?
• How long do I need to take the prescribed antibiotics?
• What are the signs that the infection is getting worse?
• Do I have an antibiotic-resistant strain like MRSA?
• What steps can I take to prevent this infection from coming back?

Q: Is a staph infection contagious?
A: Yes, staph infections can spread easily through skin-to-skin contact or by touching contaminated objects like towels, clothing, or door handles. Keeping wounds covered and washing hands frequently reduces this risk.

Q: What is the difference between a regular staph infection and MRSA?
A: MRSA stands for Methicillin-resistant Staphylococcus aureus. It is a type of staph bacteria that is resistant to many common antibiotics, making it harder to treat than standard staph infections.

Q: Can staph infections go away on their own?
A: Very minor skin infections might heal on their own, but it is risky to wait. Without treatment, the infection can spread or become deeper, so it is generally recommended to consult a doctor.

Q: How do you get a staph infection?
A: You usually get a staph infection when bacteria that are naturally on your skin or in your nose enter your body through a cut, scrape, or other break in the skin.