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Abstract:
This episode of This Week in Virology provides a clinical update from Dr. Daniel Griffin, covering a range of pressing public health issues. The discussion begins with current outbreaks, including Legionnaire's disease in New York, the continued spread of the invasive Asian longhorned tick into Maine, and a potential Ebola outbreak in the Democratic Republic of Congo. A significant portion addresses the public health implications of Florida's proposal to eliminate all childhood vaccine mandates, which is contextualized with a deep dive into the ongoing measles epidemic, with over 1,400 cases in the U.S. and nearly 5,000 in Canada. Dr. Griffin also analyzes data from the recent high-severity influenza season and a major study on risk factors for severe RSV in children, emphasizing the vulnerability of infants without pre-existing conditions. The comprehensive COVID-19 segment covers rising wastewater signals, documented spillover to domestic dogs, new data on updated vaccines, the profound real-world effectiveness of Paxlovid in reducing severe outcomes, and new NIH-funded clinical trials for Long COVID. The episode concludes with a Q&A session addressing listener questions on vaccine mandates, access, and specific booster recommendations.
3:08 Legionnaire's Disease Update: An ongoing outbreak in Harlem has resulted in 114 confirmed cases and 7 deaths. A separate, newer outbreak is occurring in Westchester County, New York, with 2 deaths and dozens sickened, highlighting the risks associated with the end of the air conditioning season.
4:16 Invasive Tick Spreads to Maine: The Asian longhorned tick, an invasive species capable of spreading spotted fevers, has been confirmed in Maine for the first time, marking its northernmost spread in the U.S. It has now been found in 20 states.
5:13 Potential Ebola Outbreak in DRC: A Level 1 travel notice has been issued for an Ebola outbreak in the Kasai province of the Democratic Republic of Congo. The potential for using ring vaccination to contain the spread is discussed.
6:29 Florida Proposes Ending All School Vaccine Mandates: Florida is moving to eliminate all vaccine requirements for schoolchildren, a decision criticized by medical professionals like Senator Bill Cassidy for risking outbreaks of preventable diseases like measles. This policy is framed as a matter of "medical freedom" but poses a threat to community immunity, especially for immunocompromised children.
10:16 Alarming Measles Statistics: As of September 9, 2025, the U.S. has recorded 1,454 confirmed measles cases, a disease previously declared eliminated. Canada is approaching 5,000 cases for the year, underscoring the direct consequences of reduced vaccination rates.
10:52 High-Severity Influenza Season Review: The 2024-2025 flu season had hospitalization rates 1.8 to 2.8 times higher than historical medians. There were 279 pediatric deaths, the highest in a non-pandemic season. Data shows that vaccination significantly reduces the risk of severe outcomes, as only 32.4% of those hospitalized had received a flu vaccine.
14:42 Key Risk Factors for Severe RSV: A large Swedish cohort study reveals that while factors like premature birth and having young siblings increase risk, the majority (60%) of infants under 3 months hospitalized with severe RSV had no underlying comorbidities. This highlights the importance of protecting all infants through maternal vaccination or monoclonal antibodies.
18:13 SARS-CoV-2 Spills Over to Domestic Dogs: A surveillance study found a 68% seroprevalence for SARS-CoV-2 antibodies among dogs in households with a known human infection, compared to just 12% in other dogs. This provides clear evidence of human-to-animal transmission.
21:10 COVID-19 Vaccine Updates and Access: Pfizer announced positive initial data from its trial of the new LP.8.1-adapted vaccine, showing a robust immune response. In response to federal restrictions, states like New York are issuing executive orders to ensure pharmacists can administer new COVID-19 vaccines to children and pregnant women.
26:47 Paxlovid Proven Effective in the Real World: A major Taiwanese cohort study involving over 2.3 million patients demonstrated that Paxlovid treatment was associated with a ~68% reduction in hospitalization and a ~60% reduction in death, even in a highly vaccinated population. Another study confirmed it helps patients feel better three days sooner.
31:49 New Long COVID Clinical Trials Announced: The NIH's RECOVER initiative is launching new trials to test treatments for Long COVID, including low-dose naltrexone, baricitanib (an immune modulator), GLP-1 agonists (weight-loss drugs), and stellate ganglion blocks. However, the patient community has expressed significant dissatisfaction with the selection of treatments being tested.
34:12 Listener Q&A Session: Dr. Griffin answers questions on a range of topics, including vaccine requirements for immigrants, strategies for obtaining a prescription for the COVID vaccine amid access issues, the differences between Moderna's vaccine formulations, and the recommendation for adults vaccinated with only one MMR dose between 1968-1989 to get a second dose.
Summary of Key References
Florida Vaccine Policy & Measles
Florida Vaccine Mandates (NY Times): Florida's surgeon general plans to eliminate all school vaccine mandates, including for measles and polio, under the banner of "medical freedom." Public health experts warn this could lead to significant outbreaks of preventable diseases.
U.S. Measles Cases (CDC): As of September 9, 2025, 1,454 measles cases have been confirmed across 42 jurisdictions in the U.S., with 92% of cases occurring in unvaccinated or unknown-status individuals.
MMR Vaccine Recommendations (CDC/NYP): Adults born before 1957 are generally considered immune. Those born later without proof of immunity should receive at least one dose. Two doses are recommended for high-risk individuals like international travelers.
Influenza & RSV
High-Severity Flu Season (CDC MMWR): The 2024-25 influenza season had the highest hospitalization rate since 2010-11. Only about a third of hospitalized patients had received a flu vaccine, highlighting the vaccine's protective effect against severe disease.
Severe RSV Risk Factors (The Lancet): A major Swedish study found that while comorbidities are risk factors, the majority of severe RSV cases occur in healthy, full-term infants under 3 months old. This supports universal immunization strategies rather than targeting only high-risk groups.
SARS-CoV-2 / COVID-19
Wastewater and Respiratory Illness Activity (CDC): While overall respiratory illness activity is low nationally, COVID-19 activity detected in wastewater is high or very high in many states, indicating significant ongoing community transmission.
Vaccine Effectiveness and Safety (Multiple): Studies reaffirm that vaccines are extremely safe, and deaths causally linked to them are exceptionally rare. The vast majority of adverse events reported to VAERS are coincidental, not causal.
Paxlovid Effectiveness (Open Forum Infectious Diseases): A massive real-world study in Taiwan showed that Paxlovid significantly reduced the risk of hospitalization (~68%) and death (~60%) from COVID-19, even in a highly vaccinated population.
Glossary of Medical Terms
Comorbidity: The presence of one or more additional health conditions co-occurring with a primary condition.
Epitope: The specific part of an antigen (like a viral protein) that is recognized by the immune system, such as by an antibody or a T-cell.
Hazard Ratio: A measure used in survival analysis to compare the risk of an event (e.g., hospitalization or death) occurring in one group versus another over time. A ratio less than 1 indicates a reduced risk in the treatment group.
Legionella: A type of bacterium that can cause a severe form of pneumonia known as Legionnaires' disease, often found in water systems like cooling towers and air conditioners.
Monoclonal Antibody: A laboratory-produced protein that mimics the immune system's ability to fight off harmful pathogens. It can be given as a passive immunization to provide immediate, temporary protection.
Paxlovid (Nirmatrelvir/Ritonavir): An oral antiviral medication used to treat COVID-19. It consists of two drugs: nirmatrelvir, which blocks the virus from replicating, and ritonavir, which boosts the levels of nirmatrelvir in the body.
Retrospective Cohort Study: A type of observational research where investigators examine existing data from the past to identify risk factors for specific outcomes in a group of people (a cohort).
Seroprevalence: The percentage of individuals in a population who have antibodies to a specific infectious agent, indicating past infection or vaccination.