Flu in kids
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Influenza in Children: Clinical Manifestations, Complications, and Prevention
Clinical Manifestations of Influenza in Children
Symptoms and Diagnosis
Influenza in children is characterized by a sudden onset of fever, chills, runny nose, cough, sore throat, headache, and muscle aches. The febrile illness typically lasts for 3-4 days, with the disease resolving in 7-10 days . High fever, cough, and rhinorrhea are the most frequently recorded symptoms in children with influenza . Laboratory confirmation of influenza is crucial as the clinical presentation in children is less characteristic than in adults. Diagnosis can be confirmed through virus culture, RT-PCR, or specific neutralizing antibodies in the blood .
Age Distribution and Severity
The median age of children with influenza A is around 2 years, while for influenza B, it is approximately 4.2 years . The majority of hospitalizations for pediatric influenza involve previously healthy infants and young children .
Complications and Hospitalization
Common Complications
Acute otitis media develops in about 24% of children with influenza, and pneumonia occurs in 9% . Other complications include febrile seizures, which are the most common neurological manifestation, occurring in various forms such as simple febrile seizures, atypical febrile seizures, and afebrile seizures .
Hospitalization Rates
The average annual rate of hospitalization associated with influenza is 0.9 per 1000 children. Outpatient visits associated with influenza are significantly more common, with rates ranging from 50 to 95 clinic visits and 6 to 27 emergency department visits per 1000 children during different influenza seasons .
Prevention and Vaccination
Vaccine Efficacy and Effectiveness
Influenza vaccines are effective in preventing cases of influenza in children older than two years. For children under six years, six need to be vaccinated with live attenuated vaccine to prevent one case of influenza. However, inactivated vaccines in children aged two years or younger are not significantly more efficacious than placebo .
Vaccination Programs
Annual seasonal influenza vaccination programs aim to reduce the burden of influenza. Some countries, like Canada and the USA, recommend universal influenza vaccination for children, while most European countries focus on vaccinating children at greater risk of influenza-related complications, such as those with underlying medical conditions and those under two years of age .
Infection Control Measures
Basic principles of managing influenza in children include prompt infection control measures, early identification of high-risk children, supportive care, and antiviral drugs. Cough etiquette, use of face masks, and hand hygiene are critical measures to reduce the risk of transmission .
Conclusion
Influenza poses a significant health burden on children, leading to high rates of hospitalization and various complications. Effective prevention through vaccination and stringent infection control measures are essential to mitigate the impact of influenza in this vulnerable population. Further large-scale studies are needed to assess important outcomes and directly compare vaccine types to enhance public health policies.
Sources and full results
Most relevant research papers on this topic
Vaccines for preventing influenza in healthy children.
Influenza vaccines are effective in preventing cases of influenza in children older than two years of age, but little evidence is available for children younger than two years of age.
Influenza A and B virus infections in children.
Most pediatric influenza hospitalizations involve previously healthy infants and young children, with laboratory confirmation being crucial due to less characteristic clinical presentations.
DOI
Incidence of influenza virus infections in children in Hong Kong in a 3-year randomized placebo-controlled vaccine study, 2009-2012.
In Hong Kong, children aged 5-17 years experienced substantial influenza infections in 5 major epidemics from 2009-2012, with homosubtypic protection following infection but no heterosubtypic protection.
DOI
The Spectrum of Influenza in Children
Asymptomatic influenza infection is less common in children than adults, but viral shedding still occurs, and post-influenza sequelae are rare in the community setting.
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