What is Staph?
Staph is a commonly used abbreviation for Staphylococcus, a group of bacteria commonly found on the skin. Dermatitis is a term that means that the skin is inflamed.
Does Staph always cause dermatitis?
No. In fact, Staph is a normal resident of the skin of animals and humans; however, it is considered an opportunist. As long as the skin is healthy, Staph is dormant. But once the skin is irritated, Staph can invade the area and multiply rapidly.
What are likely causes of this type of skin irritation?
Scratching is the most common cause. Any disorder that causes itching can create the situation which allows Staph to become a problem. Common causes of itching include fleas, inhalant allergy, and food allergy. Irritating chemicals, such as flea and tick dips, also can cause itching.
How is Staph dermatitis diagnosed?
There are two typical Staph lesions. One type begins as a red area on the skin with a pimple-like pustule in the center. The other type is a circular, reddish area with a crusty edge and hair loss in the center. The latter can easily be confused with ringworm. Finding either of these skin patterns in a dog that is scratching is highly suggestive of Staph.
Confirmation can be made with cultures or skin biopsy. However, the lesions are so typical that this is usually not necessary.
How is Staph dermatitis treated?
This bacterium is usually sensitive to several antibiotics. These include erythromycin, enrofloxacin, amoxicillin with clavulanic acid, lincomycin, dicloxacillin, and oxacillin. Since these medications can be given orally, treatment can occur at home. However, some infections may require 3-6 weeks of treatment before the infection is under control. Antibacterial shampoos such as the DermaTechRx Body Wash and ointments can also be helpful to bring about rapid control of the infection.
The other essential part of treatment is stopping the itching and scratching. Other tests may be needed to determine the cause or causes. Frequently, more than one condition contributes to itching.
Is my dog contagious to me or other pets?
No. All dogs, cats, and people have Staph living on the skin as a normal resident.
I finished treatment for Staph dermatitis two weeks ago, and now the Staph infection is back. Why is that?
This situation may be caused by an allergy to the Staph bacteria. This is called Staph hypersensitivity or Staph allergy. The skin lesions that are caused by this disease are identical to those of a Staph dermatitis. The difference is recurrence. If Staph dermatitis is treated properly, the underlying cause is eliminated and itching is stopped, the bacterial skin disease should be eliminated. This situation may return if itching returns. However, when the dog with Staph hypersensitivity is treated, the skin lesions will return within a few days or weeks.
Since differentiation of Staph dermatitis and Staph hypersensitivity is based largely on recurrence, it is very important that treatment be continued long enough. This often means a month or more of antibiotics. If not, there will still be a question of which disease is present.
How is Staph hypersensitivity treated?
Treatment begins the same as for Staph dermatitis: oral antibiotics, medicated shampooing, and whatever is necessary to stop the itching. However, long-term control is best achieved with Staph bacterin. Staph bacterin is a solution of killed Staph bacteria that is injected into the dog in very tiny amounts. This is an attempt to reprogram the dog’s immune system so it does not over-react to its own bacteria. The use of Staph bacterin begins as a series of daily injections into the layers of the skin. After the initial series is completed, the injections are given subcutaneously (just below the skin) on an interval of every 3-4 days to every 2 weeks. Since this is an ongoing treatment, it is done by you at home.
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