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COVID-19 linked to long-lasting reductions in smell even without noticeable symptoms

People who suspect that their sense of smell has been dulled after a bout of COVID-19 are likely correct, a new study using an objective, 40-odor test shows. Even those who do not notice any olfactory issues may be impaired.

25 Sep 2025

Amendments to the International Health Regulations enter into force worldwide

Today marks a milestone in global health governance as the amendments to the International Health Regulations (IHR) enter into force.

21 Sep 2025

Why universal COVID-19 vaccine guidance offers stronger protection than high-risk-only policies

The US Scenario Modeling Hub’s nine-team ensemble projected COVID-19 hospitalizations and deaths for April 2024 to April 2025 under six policy and immune-escape scenarios. Burden was similar to the prior year, with universal vaccination recommendations averting more outcomes than high-risk-only guidance, especially for adults aged 65 years and older.

21 Sep 2025

Long COVID linked to heavier periods and symptom flare-ups during menstruation

Researchers found that long COVID is linked to heavier, longer, and more irregular bleeding without disrupting ovulation. Symptom severity also peaks around menstruation, likely driven by hormonal and immune changes.

17 Sep 2025

AI breakthrough offers a new way to predict and visualize disease processes

To solve a problem, we have to see it clearly. Whether it's an infection by a novel virus or memory-stealing plaques forming in the brains of Alzheimer's patients, visualizing disease processes in the body is the first step toward alleviating human suffering. It's also often the most difficult and costly.

16 Sep 2025

Persistent COVID-19 in the intestines may drive inflammation in cancer patients

New research from the University of Minnesota Medical School is providing important insights into how COVID-19 persists in cancer patients even long after testing positive. The findings were recently published in iScience.

10 Sep 2025

Concertgoers back detection dogs as practical COVID-19 screening tool in real-world trial

A feasibility study in Germany found that concertgoers strongly supported medical detection dogs for COVID-19 screening, with confidence rising after real-world use. The findings suggest canine testing could complement PCR and antigen tests, especially in large gatherings and high-traffic environments.

8 Sep 2025

Can an allergy spray help prevent COVID-19?

Researchers determine the efficacy and safety of azelastine nasal spray for preventing SARS-CoV-2 infection in healthy adults.

8 Sep 2025

Scientists uncover human proteins hijacked by SARS-CoV-2 for replication

Despite vaccines and treatments, SARS-CoV-2-the virus that causes COVID-19-continues to pose a global health threat, driven by new variants and its ability to hijack human cells in ways that still aren't fully understood.

5 Sep 2025

Hidden protein particle in COVID virus may lead to longer-lasting vaccines

A protein particle hidden within the SARS-CoV-2 virus could lead to longer-lasting, more protective vaccines for COVID-19.

4 Sep 2025

How effective is the RSV vaccine for older adults?

A single dose of the RSV vaccine offers 58% protection against hospitalization in older adults, but effectiveness varies in immunocompromised individuals.

3 Sep 2025

Azelastine nasal spray significantly reduces SARS-CoV-2 infections in clinical trial

The trial, led by Professor Robert Bals, Director of the Department of Internal Medicine V at Saarland University Medical Center and Professor of Internal Medicine at Saarland University, divided the 450 participants into two groups.

2 Sep 2025

New guidelines improve care for respiratory infections in leukemia patients

People with leukemia have a weakened immune system due to the disease itself and treatment, which leads to an increased susceptibility to infections.

28 Aug 2025

Scientists develop promising broad-spectrum antiviral targeting deadly viruses

Researchers at the Nanoscience Initiative at the Advanced Science Research Center at the CUNY Graduate Center (CUNY ASRC) have made a breakthrough in the fight against viral diseases.

28 Aug 2025

Common cold may offer temporary protection against SARS-CoV-2 infection

A new study led by researchers at National Jewish Health has found that recent infection with the common cold - often caused by rhinoviruses - may offer temporary protection against infection with SARS-CoV-2, the virus that causes COVID-19.

25 Aug 2025

COVID-19 vaccine successes boosted hesitancy - can trust and equity restore immunization?

Researchers show that countries with higher initial COVID-19 vaccine acceptance also achieved stronger booster uptake, but trust and access remain decisive. The commentary warns that vaccine successes also fueled hesitancy, demanding structural reforms, clear communication, and proactive strategies to protect immunization.

21 Aug 2025