Introduction:

Children mild acute myositis is a transitory complication of the flu caused by the influenza A or B viruses which presents in school patients.

Objectives:

To contribute to spread the characteristics of children mild acute miositis in the medical staff.

Methods:

Descriptive cross-sectional research in 18 patients with ages under the 19 years that were attented with a diagnosis of the disease in “Cerro” Pediatric Teaching Hospital from October 1st to December 31st, 2019. There were taken blood samples to do enzymatic and hematologic studies, antidengue antibodies determination and nasopharinx exudates looking for respiratory viruses. SSPS version 19 program was used. The results were expressed in absolute values, percentages, averages and standard deviation.

Results:

There was predomiance of the ages from 5 to 14 years (88%), male sex (72.2%) and living in Cerro and 10 de octubre municipalities (55,5% and 22,2%, respectively). The most frquent type of abnormal walk was the Frankenstein with an average leukocytes count of 7.01 × 109 ± 2.16; lymphocytea of 53.3%; and an average of creatinine fosfoquinase 591 µl × L ± 435.74. All the patients recovered. The influenza B virus was identified in 77.7% of the samples.

Conclusions:

Myositis represented a complication by influenza viruses, mainly the type B, in school male patients who showed disorders in the walk, normal neurologic examination and high creatinine phosphokinase. All the patients recovered in the first 3 days after the onset of the disease.

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