Four glass vials sit on a reflective tabletop next to a syringe. Each is labeled as a subsequent dose in a four-dose series of COVID-19 vaccines.
What We Know About Getting a Second Booster Shot of COVID-19 Vaccines
Studies show that a fourth mRNA vaccine dose offers the elderly and other high-risk groups strong protection against hospitalization and death from COVID-19, but experts say benefits for other populations may be more limited.
What We Know About Getting a Second Booster Shot of COVID-19 Vaccines
What We Know About Getting a Second Booster Shot of COVID-19 Vaccines

Studies show that a fourth mRNA vaccine dose offers the elderly and other high-risk groups strong protection against hospitalization and death from COVID-19, but experts say benefits for other populations may be more limited.

Studies show that a fourth mRNA vaccine dose offers the elderly and other high-risk groups strong protection against hospitalization and death from COVID-19, but experts say benefits for other populations may be more limited.

epidemiology
Ribbon diagram of the protein coat of an adeno-associated virus
Preprints Propose Constellation of Causes for Kids’ Liver Disease
Christie Wilcox | Jul 25, 2022
Two independent groups suggest the suite of recent unexplained hepatitis cases may stem from coinfection with an adeno-associated virus and a helper adeno- or herpesvirus, a duo which may be especially virulent in children with a particular genetic variant.
Professional headshot of Steven Seifert
Toxicologist, Doctor, and Jazz Musician Steven Seifert Dies at 72
Dan Robitzski | Jul 12, 2022
Seifert is well known for his clinical toxicology work, particularly his findings around snake envenomation and antivenoms.
Discover the predictive power of wastewater for tracking pathogens
Wastewater’s Hidden Value for Monitoring Public Health
The Scientist Creative Services Team and Bio-Rad Laboratories
Learn about wastewater-based epidemiology—from its conception to its present state and into its future.
Egyptian fruit bat hanging from branch
Marburg Virus Detected in Ghana for First Time
Andy Carstens | Jul 8, 2022
Preliminary testing indicates that the two people died from the Ebola-like virus, the World Health Organization says.
Aerial view of crowd connected by lines
Monkeypox: What We Know (and What We Don’t)
Andy Carstens | Jun 24, 2022
The longer and farther the virus spreads, the more likely it could become endemic in new areas, says UCLA epidemiologist Anne Rimoin.
Researchers use bacterial whole genome sequencing to compare the phylogenetic relationship between environmental and clinical samples.
Aquatic Bacteria Reveal a Common Genetic Link to a Deadly Human Pathogen
Iris Kulbatski, PhD
Researchers use genetic clues to track the spread of antibiotic resistant bacteria from the environment to patients.
animation showing how proximity affects viral transmission
Monkeypox Likely Spread Undetected in US Before Recent Reports  
Andy Carstens | Jun 6, 2022
Two strains of monkeypox have been detected in the US, suggesting the virus has been circulating in the country for some time, the CDC says.
Grey and white image of transmission electron tomography of monkeypox virus
US Case Adds to Unusual Monkeypox Outbreak
Natalia Mesa | May 19, 2022
Experts are scrambling to understand clusters of the normally rare disease that have been reported in Europe and North America in the last month.
Close-up of a fiber with brightly colored pathogens beside it
Microplastics in Seawater May Harbor Parasites
Christie Wilcox | Apr 26, 2022
Laboratory experiments find that Toxoplasma, Cryptosporidium, and Giardia can congregate on microplastic beads and fibers, suggesting they might make their way into and around the world’s oceans by hitching rides on tiny bits of trash.
Tiled blue-gray MRI readouts of a human brain.
Cancer Tied to Reduced Risk of Alzheimer’s Disease
Dan Robitzski | Apr 14, 2022
Observational evidence for the connection is solidifying, and some clues are emerging about the mechanisms that may explain it.
An artist’s rendering of the Omicron variant portrays the virus as a lumpy blue sphere with several orange spike proteins jutting out of it.
Omicron Propagates 70 Times Faster than Delta in Bronchi: Study
Dan Robitzski | Dec 17, 2021
A preprint reports that the new SARS-CoV-2 variant multiplies faster in human bronchial tissue but slower in lung tissue than the Delta variant, potentially explaining how it’s spreading from person to person so quickly.
Artist’s renderings of SARS-CoV-2 float in front of a map showing the origins of various variants of the virus.
Omicron Is WHO’s Fifth Variant of Concern, Experts Urge Patience
Dan Robitzski | Nov 30, 2021
Preliminary data suggest that the newly dubbed Omicron variant may be more infectious than previous versions of the virus, but it will take time to obtain the reliable data needed to answer pressing questions about its biology.
A grid of images showing different cross sections of a human brain MRI.
Study Links Flu to Increased Parkinson’s Risk a Decade Later
Dan Robitzski | Nov 19, 2021
Epidemiological research suggests that a flu diagnosis might be one factor in the eventual onset of the neurodegenerative disease, but experts say it doesn’t prove a causal relationship.
Man in a white shirt and a large backpack stands on a hill overlooking dense forest
Public Health Pioneer Peter Pharoah Dies at 87
Dan Robitzski | Nov 11, 2021
Pharoah’s work ended endemic cretinism in a remote region of Papua New Guinea and contributed to the understanding of myriad other perinatal health conditions.
a veterinarian in a white hazmat suit holding a small pig
The Long Journey to Resolve the Origins of a Previous Pandemic
Martha Nelson | Sep 2, 2021
Dozens of researchers, including myself, worked for years to uncover that swine flu had leapt to humans from a pig in Mexico in 2009. We learned a lot about influenza evolution, pig farming, and outbreak risk along the way.
photo of Abidjan skyline, which includes skyscrapers near a shoreline and white clouds against a blue sky
Ivory Coast Confirms First Ebola Case Since 1994
Annie Melchor | Aug 16, 2021
Officials say it’s not yet clear whether this case is linked to an outbreak in Guinea earlier this summer.
photograph of miSHERLOCk device against a white background
A Self-Contained COVID-19 Test with 3-D Printed Parts
Annie Melchor | Aug 11, 2021
The makers of the CRISPR-based testing platform, called miSHERLOCK, say it could enable people at home or physicians in resource-limited environments to detect SARS-CoV-2—and eventually, other pathogens.
part of West Africa as shown on a desk globe
Marburg Virus Disease Detected in West Africa for First Time
Shawna Williams | Aug 10, 2021
The finding of the Ebola-like disease, which killed a man in Guinea, has prompted public health measures.
art+graph showing rise and fall of three different covid variants
Dissecting the Unusual Biology of the SARS-CoV-2 Delta Variant
Katarina Zimmer | Aug 9, 2021
An ability to build up higher concentrations of viral particles in people’s airways and mutations that might boost its ability to infect human cells could be what gives the Delta variant its evolutionary edge.