Influenza B: Fever persists for three days despite intravenous fluid administration – what could be the reason?

　　Influenza B usually refers to Influenza B, while "diao shui" generally refers to intravenous (IV) infusion. Generally speaking, the main reasons why fever does not subside after three days of IV treatment for Influenza B may include individual differences in immunity, strong viral virulence, coexisting infections, delayed drug effectiveness, or underlying medical conditions. If symptoms persist, it is recommended to seek timely treatment at a正规 hospital. Detailed analysis is as follows:

　　1. Individual differences in immunity

　　The strength of immune system function varies among individuals. Those with weaker immunity may have a poor ability to clear the Influenza B virus, and body temperature may still take longer to return to normal even after IV infusion. It is recommended to enhance nutrition by consuming foods rich in vitamins and proteins, such as lean meats, fresh vegetables, and fruits, while also ensuring adequate sleep to support immune system function.

　　2. Strong viral virulence

　　When the strain of Influenza B virus has strong virulence, it may multiply extensively in the body and cause significant damage. Fever may persist because three days of IV treatment may be insufficient to rapidly control the illness. After medical evaluation, antiviral medications may be adjusted, such as using Peramivir Sodium Chloride Injection, Oseltamivir Capsules, or Zanamivir Inhalation Powder to enhance antiviral therapy.

　　3. Coexisting infections

　　Influenza B may be accompanied by bacterial infections such as bacterial pneumonia or acute tonsillitis. Intravenous treatment alone may not cover these additional infections, leading to persistent fever. Relevant tests should be promptly conducted to identify the type of infection, and antibiotics such as Cefuroxime Axetil Tablets, Azithromycin Dispersible Tablets, or Amoxicillin Clavulanate Potassium Tablets may be added under a doctor's guidance.

　　4. Medication has not yet fully taken effect

　　Medications require a certain amount of time to work. Particularly for patients with severe illness, three days of IV infusions may not have achieved sufficient drug concentration to control viral replication and inflammatory responses, resulting in persistent fever. Patients should continue treatment as directed by their physician, closely monitor changes in body temperature, and avoid discontinuing or adjusting medication doses without medical advice.

　　5. Presence of underlying diseases

　　If the patient already suffers from chronic conditions such as chronic obstructive pulmonary disease (COPD) or diabetes, these may affect the body's recovery capacity and response to treatment, causing fever to persist after IV treatment for Influenza B. While treating the flu, active management of underlying conditions is necessary. For example, diabetic patients should strictly control blood sugar levels and may use medications such as Insulin Injection, Metformin Tablets, or Glimepiride Tablets under a doctor's supervision.

　　In daily life, it is important to drink plenty of water to promote metabolism, maintain good indoor air circulation by regularly opening windows for ventilation, avoid fatigue to reduce physical strain, and closely monitor body temperature and illness progression. If serious symptoms such as rapid breathing or confusion occur, seek immediate medical attention.