How long a staph infection lasts depends entirely on where it is in your body. A minor skin infection like a boil typically clears within one to three weeks with proper treatment, while a deep infection in bone or heart tissue can require six or more weeks of antibiotics. Food poisoning caused by staph toxins is on the opposite end of the spectrum, usually resolving on its own within 24 to 48 hours.
Skin Infections: The Most Common Type
Most people searching this question have a skin infection, such as a boil, abscess, or area of cellulitis. These are by far the most frequent staph infections, and the timeline follows a fairly predictable pattern. A small boil that drains on its own or is lanced by a doctor often heals within one to two weeks. Larger abscesses that need to be surgically drained, or patches of cellulitis treated with oral antibiotics, generally take two to three weeks to fully resolve.
You should start seeing improvement within a few days of beginning antibiotics or having an abscess drained. If the redness is still spreading or pain is worsening after 48 to 72 hours on antibiotics, that’s a sign the medication isn’t working and you may need a different one. This is more common with antibiotic-resistant strains like MRSA, which require specific drugs to clear.
Staph Food Poisoning
Staph food poisoning works differently from other staph infections. The illness comes from a toxin the bacteria produced in the food before you ate it, not from an active bacterial infection in your body. Symptoms like nausea, vomiting, and cramping hit fast, typically within 30 minutes to 8 hours of eating contaminated food, and they usually pass within one to two days without antibiotics.
How Long You’re Contagious
A staph skin infection is contagious as long as the wound is open, draining, or oozing. Once you’ve been on effective antibiotics for about 48 hours, you’re generally no longer considered contagious, though you should still keep wounds covered until they’re fully healed. Direct skin-to-skin contact and sharing towels or razors are the main ways staph spreads.
The bacteria itself can survive on surfaces longer than most people expect. Staph persists on plastic and vinyl for up to five days, and on fabrics for several days. Some research has found MRSA surviving on dry surfaces for months under certain conditions. Washing bedding, towels, and clothing in hot water during an active infection reduces the risk of reinfection or spread to others.
MRSA vs. Regular Staph
MRSA infections tend to take longer to resolve than infections caused by ordinary, antibiotic-susceptible staph. Part of the reason is practical: it can take a few days to identify that a strain is resistant, meaning the first antibiotic prescribed may not work, which delays healing. Hospital data shows that MRSA infections are associated with 6 to 14 extra days of hospitalization compared to susceptible staph infections, reflecting both the greater difficulty of treatment and the higher rate of complications.
For skin infections, the difference is less dramatic. A MRSA boil treated with the right antibiotic and proper drainage heals on a similar timeline to a regular staph boil. The gap widens with deeper or bloodstream infections, where MRSA limits the available treatment options and often requires intravenous antibiotics for longer periods.
Bloodstream and Deep Infections
When staph enters the bloodstream, treatment timelines extend significantly. The standard antibiotic course for a staph bloodstream infection is 28 days. In uncomplicated cases where imaging rules out heart valve involvement, blood cultures clear within two to four days, and fever resolves within 72 hours, doctors may shorten treatment to about 14 days.
If the infection reaches the heart valves (endocarditis), treatment runs a minimum of six weeks and sometimes longer if complications develop. Infections involving prosthetic heart valves or implanted devices also require at least six weeks of intravenous antibiotics and often surgical removal of the device.
Bone Infections
Staph is the most common cause of bone infections, and these are among the slowest to resolve. Children with acute bone infections typically need about four weeks of antibiotics. Adults with chronic bone infections face a longer road: the standard approach involves two to six weeks of intravenous antibiotics, often followed by oral antibiotics, bringing the total treatment duration to four to eight weeks. Some complex cases require surgery to remove dead bone tissue alongside the antibiotic course.
Staph Colonization Can Persist for Years
One reason staph infections sometimes seem to keep coming back is that the bacteria can live in your nose and on your skin without causing symptoms. This is called colonization, and it’s surprisingly persistent. A study tracking patients with MRSA colonization found that nearly half were still carrying the bacteria after one year. About 28% remained colonized after two years, and roughly 21% were still carriers four years later. Previously colonized individuals are considered at high risk of continued carriage for at least four years.
Colonization doesn’t mean you’re sick. About 30% of the general population carries staph in their nose at any given time. But if you keep getting recurrent staph skin infections, your doctor may test your nose and prescribe a short course of a topical antibiotic ointment applied inside the nostrils to reduce the bacterial load. Bathing with antiseptic washes can also help break the cycle of reinfection.
Timeline Summary by Infection Type
- Food poisoning: 1 to 2 days
- Minor skin infection (boil, impetigo): 1 to 3 weeks
- Cellulitis or larger abscess: 2 to 3 weeks
- Bloodstream infection: 2 to 4 weeks of IV antibiotics
- Bone infection: 4 to 8 weeks of antibiotics
- Heart valve infection: 6 weeks minimum of IV antibiotics
- Nasal colonization (no symptoms): months to years without decolonization