Compared to other forms of prevention, a unique issue for pandemic preparedness is that it is forever unclear what pathogen, exactly, the world needs to be prepared for. There are an estimated 300,000 viruses that infect mammals; add in birds, and the estimate grows to more than half a million. Some of those viruses are much greater threats than others.

Transplanting an animal organ into a human is now a closer reality following the successful xenotransplantation of a genetically modified pig liver into a patient diagnosed with brain death in China. The operation was intended to evaluate organ function over a 10-day period. This is a complex experimental trial that did not involve removing the patient's liver and still requires further study. However, the positive preclinical results suggest this strategy could save the lives of those waiting for a human organ, at least in certain cases.

In 2020, the Conference on Retroviruses and Opportunistic Infections (CROI) was the first scientific conference to move from in-person to virtual due to the COVID-19 pandemic. On the fifth anniversary of the virtual conference, and the pandemic, some of those earliest COVID-19 patients have still not recovered.

At the 2025 meeting of the Conference on Retroviruses and Opportunistic Infections (CROI) it was the best of times, it was the worst of times. On the first full day of the conference, reports from the first HIV cure trial conducted in Africa, the RIO trial and others showed that perhaps, a broadly useful cure is on the horizon.

New research has uncovered a complex interplay between extracellular matrix (ECM) structure and the transcriptional responses of cancer cells, showing how they alter their gene expression to ‘escape’ from ECM. The findings will make it easier to identify tumors that are likely to metastasize at an early stage.

According to the World Health Organization (WHO), multidrug-resistant pathogens caused over 1.27 million deaths worldwide in 2020. And figures are rising, with projections pointing to antimicrobial resistance surpassing cancer as the leading cause of death by 2050. Now, researchers at the HUN-REN Biological Research Center have unveiled the role of pre-existing genetic variabilities and specific cross-resistance patterns among several antibiotics designed to combat gram-positive bacteria.

2024 saw the completion of several cellular-resolution brain maps, including the entire fly brain and a comprehensive connections map of a cubic centimeter of human brain. 2025 began with the addition of another important map. In the Jan. 1, 2025, issue of Nature, researchers from the Allen Institute presented a map of areas and cell types where aging most affected the mouse brain.

Although it does not generally infect humans, a single mutation of the H5N1 virus in the highly pathogenic avian and bovine clade 2.3.4.4b could overcome this barrier and possibly trigger a pandemic.

An international consortium of thousands of scientists is creating the Human Cell Atlas, a three-dimensional map of all the cells in the body. The goal is to understand all the cells that make up human tissues, organs and systems, which will enable multiple medical applications. This collection of cell maps is openly available for navigation at single-cell resolution, identified through omics analyses that reveal the tridimensional distribution of each cell.

Scientists from different laboratories around the world have presented the latest advances in research into malignant brain tumors at the 31st Annual Congress of the European Society of Gene and Cell Therapy (ESGCT), which is being held Oct. 22 to 25 in Rome.