Influenza

Influenza (the flu) is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to death. The best way to prevent the flu is by getting a flu vaccination each year. Every year in the United States, on average 5% to 20% of the population gets the flu; more than 200,000 people are hospitalized from flu complications, and; about 36,000 people die from flu-related causes. Some people, such as older people, young children, and people with certain health conditions, are at high risk for serious flu complications.

Types of Influenza

Influenza is caused by three types of RNA viruses called influenza types A, B and C, which all belong to the family Orthomyxoviridae.

Influenza Immunization

Influenza Epidemiology

Influenza Prognosis

Influenza Symptoms

Influenza Treatments

Influenza Pandemics

Influenza Research

Influenza Infection in Animals

Should I get the Flu Shot?

Latest Influenza News and Research

Predicting H5N1 disease severity based on T cell responses

New research led by scientists at La Jolla Institute for Immunology (LJI) suggests that many people already have immune cells on "stand by" to fight the H5N1 virus, also known as highly pathogenic avian influenza.

2 Jan 2025

Mild avian flu cases in US spark safety warnings for poultry and dairy sectors

Researchers identify 46 mild cases of avian influenza A(H5N1) in U.S. poultry and dairy workers, highlighting low PPE adherence and potential outbreak risks.

2 Jan 2025

Blood cells linked to long-lasting vaccine immunity

When children receive their second measles-mumps-rubella vaccine, around the time they start kindergarten, they gain protection against all three viruses for all or most of their lives.

2 Jan 2025

Public health experts outline critical steps in handling HPAI H5N1 spread

Highly pathogenic H5N1 avian influenza A virus (HPAI H5N1) remains a low risk to the general public, and public health experts in the United States believe that available treatments and vaccines, as well as those in development, are sufficient to prevent severe disease.

2 Jan 2025

AI-driven surveillance system to combat emerging infectious diseases

Researchers have come up with a new way to identify more infectious variants of viruses or bacteria that start spreading in humans - including those causing flu, COVID, whooping cough and tuberculosis.

2 Jan 2025

Scientists pinpoint regions and species fueling coronavirus evolution in bats

Study uncovers the evolution, transmission, and geographic spread of bat coronaviruses in China, revealing key insights into hotspots and the origins of SARS-CoV-2.

1 Jan 2025

RSV vaccine acceptance grows amidst rising flu concerns

A year after becoming available, vaccines to protect against RSV in newborns and older adults are being more widely accepted by the American public, according to a new Annenberg Public Policy Center (APPC) health survey conducted in November 2024.

23 Dec 2024

Shiitake-based supplement may help prevent liver damage progression

AHCC demonstrates potential in preventing liver fibrosis progression by inhibiting HSC activation and regulating key pathways involved in liver injury.

20 Dec 2024

A scaffolded vaccine approach for broader influenza protection

Most people who get the seasonal influenza vaccine – which contains strains of viruses from distinct virus subtypes – mount a strong immune response to one strain, leaving them vulnerable to infection by the others, and researchers have long wondered what impacts such variable responses more – host genetics or prior exposure to virus strains.

19 Dec 2024

Pregnant women must be prioritized in pandemic vaccination programs

The vast majority of women who contract bird flu during pregnancy and their unborn baby will die from the virus, according to a new study. And the findings stress the importance of early inclusion of pregnant women in public health vaccination programs during pandemics.

19 Dec 2024

New design could make seasonal influenza vaccinations more broadly effective

Stanford Medicine scientists have designed a way to make our seasonal influenza vaccinations more broadly effective and possibly to protect us from new flu variants with pandemic potential.

19 Dec 2024

Breastfeeding after COVID-19 vaccination is safe, with minimal changes to milk composition

This study reveals how SARS-CoV-2 infection significantly alters human milk composition, while COVID-19 vaccination causes minimal, transient changes, underscoring the safety of breastfeeding during vaccination.

19 Dec 2024

Scientists detect rare H5N1 avian flu strain in Australian child after travel to India

A 2.5-year-old returning to Australia from India was infected with a reassortant H5N1 virus, revealing genetic mixing between avian influenza clades and gaps in South Asian surveillance.

18 Dec 2024

Study reveals underuse of antivirals for children hospitalized with influenza

Despite national medical guidelines supporting the use of antiviral medications in young children diagnosed with influenza, a recent study reports an underuse of the treatment.

17 Dec 2024

Breakthrough in understanding influenza's protective coat opens path to new treatments

To fight the virus that causes influenza, one of the avenues being explored by scientists is the development of drugs capable of destabilizing its genome, made up of eight RNA molecules.

17 Dec 2024

Breakthrough microchip technology enables multi-disease detection

In a world grappling with a multitude of health threats -; ranging from fast-spreading viruses to chronic diseases and drug-resistant bacteria -; the need for quick, reliable, and easy-to-use home diagnostic tests has never been greater. Imagine a future where these tests can be done anywhere, by anyone, using a device as small and portable as your smartwatch.

16 Dec 2024

Raw milk may carry hidden risks of flu transmission

Raw milk, hailed by some as a natural and nutritious alternative to pasteurized dairy, may come with hidden dangers, according to a new Stanford University study.

14 Dec 2024

Widening childhood vaccination inequality in England raises concerns

Inequalities in childhood vaccination are widening in England, with uptake rates of five key vaccines consistently lower in young children living in areas of higher deprivation from 2019 to 2023, finds a study published by The BMJ today.

11 Dec 2024

Single mutation in (HPAI) H5N1 influenza virus could increase human transmission risk

A single modification in the protein found on the surface of the highly pathogenic avian influenza (HPAI) H5N1 influenza virus currently circulating in U.S. dairy cows could allow for easier transmission among humans, according to new research funded by the National Institutes of Health (NIH) and published today in the journal Science.

9 Dec 2024

Bovine H5N1 influenza shows potential for human adaptation through key mutations

Recent study reveals H5N1 mutations enhancing human receptor binding, highlighting pandemic risks and the need for vigilant surveillance of influenza strains.

9 Dec 2024