Benign acute myositis associated with H1N1 influenza A virus infection

Area of Science:

• Pediatrics
• Infectious Diseases
• Neurology

Background:

• Benign acute myositis is a reversible inflammatory condition affecting muscles.
• Influenza A virus, particularly novel strains like H1N1, can trigger myositis in children.
• Previous outbreaks of seasonal influenza have been associated with benign acute myositis.

Observation:

• Four pediatric cases of benign acute myositis were observed during the H1N1 influenza A virus outbreak.
• Patients presented with typical flu symptoms and significant difficulty walking.
• Clinical and laboratory features were consistent with previous reports of influenza-associated myositis.

Findings:

• All four children recovered quickly without recurrence.
• No antiviral treatment, such as oseltamivir, was required for these cases.
• The observed cases align with the known association between influenza and benign acute myositis.

Implications:

• Diagnosing benign acute myositis should be considered in children presenting with H1N1 symptoms and gait disturbances.
• Recognizing this condition can help clinicians avoid unnecessary diagnostic procedures.
• Prompt identification facilitates appropriate supportive care and reassures families about the typically benign and self-limiting nature of the condition.