Is it contagious the day before fever from甲流?

Mar 10, 2025 Source: Cainiu Health

Dr. Ren Yi

Introduction

Under normal circumstances, "swine flu" refers to influenza A, and "fever" indicates an elevated body temperature. Influenza A is contagious one day before the onset of fever. In daily life, attention should be paid to personal hygiene. Wash hands frequently with soap or hand wash under running water, and avoid using dirty towels to wipe hands. When coughing or sneezing, cover the mouth and nose with tissues or towels to prevent droplet transmission.

Generally speaking, "swine flu" refers to influenza A, and "fever" indicates an elevated body temperature. Influenza A is contagious one day before the onset of fever. Detailed explanation is as follows:

The influenza A virus is highly contagious and typically begins shedding one day before symptoms appear, at which point it becomes infectious. This is because after infection with the influenza A virus, it undergoes a process of replication within the human body. Before obvious symptoms such as fever develop, the virus has already multiplied extensively in areas like the respiratory tract and is expelled from the body through coughing, sneezing, or talking, entering the surrounding environment and potentially infecting others. Moreover, the virus remains highly contagious for 3 to 5 days after the onset of illness.

In daily life, attention should be paid to personal hygiene: wash hands frequently with soap or hand sanitizer and running water, and avoid using dirty towels to dry hands. When coughing or sneezing, cover the mouth and nose with tissues or towels to prevent droplet transmission. At the same time, maintain cleanliness and ventilation in living environments by regularly opening windows to ensure fresh indoor air.

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Is dizziness after influenza A a sign of recovery?

Under normal circumstances, "Jia Liu" refers to Influenza A H1N1. Whether dizziness following Influenza A H1N1 indicates recovery depends on the specific circumstances. If dizziness is the only symptom present without other accompanying symptoms, it usually suggests the condition is improving. However, if dizziness is accompanied by other systemic symptoms such as headache, tinnitus, or fatigue, it may not indicate improvement. If any discomfort persists, prompt medical attention is recommended.

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How is influenza A transmitted?

In general, influenza A is mainly transmitted through respiratory droplets, close contact, airborne aerosols, contact with contaminated objects, and mother-to-child transmission. It is recommended to take proper personal protective measures in daily life, wear masks correctly when going out, and avoid crowded places. Wash hands frequently with soap or handwash and running water.

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What medication can be taken to prevent H1N1 flu in advance?

In general, influenza A can be prevented through vaccination and the use of antiviral medications. Drugs used for prophylaxis should be taken under medical supervision and commonly include oseltamivir phosphate capsules, zanamivir inhalation powder, peramivir chloride injection, baloxavir marboxil tablets, and Lianhua Qingwen capsules. It is also important to maintain good daily habits, such as frequent handwashing.

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What are the differences between influenza and mycoplasma pneumonia?

In general, the main differences between influenza and mycoplasma pneumonia include different causative pathogens, varying symptom presentations, differing levels of contagiousness, distinct high-risk populations, and different treatment medications. If respiratory discomfort occurs, it is recommended to seek medical attention promptly for an accurate diagnosis. In daily life, it is important to frequently wash hands, wear masks, and avoid crowded places; when symptoms such as fever and cough appear.