What are the symptoms of a child with type A flu having a high fever of 40°C?

Influenza A refers to influenza A virus infection, and "high fever" indicates a high body temperature. Generally, when children have influenza A with a high fever of 40°C, symptoms may include febrile convulsions, coughing, runny nose and nasal congestion, headache, and muscle pain. Detailed explanations are as follows:

1. Febrile Convulsions: Children's nervous systems are not fully developed, and high fever can cause abnormal discharges of brain neurons, leading to generalized or localized muscle spasms. When body temperature rises sharply to 40°C, some children may experience convulsions.

2. Coughing: Infection with the influenza A virus causes inflammation of the respiratory mucosa, stimulating receptors on the respiratory mucosa and triggering a cough reflex. The cough may be dry and vary in severity.

3. Runny Nose and Nasal Congestion: Under stimulation by the influenza A virus, the nasal mucosa in children becomes inflamed, causing vasodilation and increased glandular secretion. Initially, nasal discharge is usually clear, but as the illness progresses, it may become thicker, leading to nasal congestion.

4. Headache: The influenza A virus triggers inflammatory responses in the body, and inflammatory mediators can stimulate nerve endings, potentially causing headaches. Children may not be able to express this accurately and often appear irritable or restless.

5. Muscle Pain: Influenza A virus infection results in inflammatory mediators that irritate muscle tissues. Children may feel muscle pain in limbs, the waist, the back, and other areas. They may show reduced activity and be unwilling to walk or stand.

If a child has influenza A with a high fever of 40°C, it is recommended to seek timely medical attention. Under a doctor's guidance, medications such as oseltamivir phosphate granules, paracetamol tablets, and ibuprofen sustained-release tablets can be used to help alleviate symptoms. It is also important to maintain good lifestyle habits and avoid consuming spicy or irritating foods such as pepper, chili peppers, and garlic, as these may hinder recovery.