In this clinical update from "This Week in Virology," Dr. Daniel Griffin and Vincent Racaniello discuss a range of pressing public health topics. They begin with news of a significant Salmonella typhimurium outbreak linked to raw milk, the politically charged resignation of an FDA official, and the Senate's confirmation of Dr. Susan Monarez as the new CDC director. The conversation covers a recent KFF poll revealing a partisan divide in COVID-19 vaccine trust, despite high confidence in other routine vaccines. Dr. Griffin provides updates on rising measles cases, influenza statistics, and COVID-19 trends, which appear to be leveling off. Key clinical studies are analyzed, including a trial showing that dual antiviral therapy (baloxavir plus a neuraminidase inhibitor) significantly reduces mortality in severe influenza cases. He also reviews a large Danish study confirming the safety of the updated JN.1 COVID-19 vaccine, which showed no increased risk of adverse events. A significant portion is dedicated to Long COVID, highlighting a study that found persistent, objective cardiovascular and pulmonary abnormalities in patients via advanced imaging. The episode concludes with a Q&A session addressing listener questions on the RSV vaccine in pregnancy, the Chikungunya vaccine for travel, and the importance of precise scientific communication regarding vaccine effectiveness.
Navigating the Latest in Infectious Diseases: A Clinical Update
8:04 Raw Milk Causes Major Salmonella Outbreak: Dr. Griffin discusses a large Salmonella outbreak with 171 cases linked to commercially distributed raw milk in California and other states. The outbreak caused significant illness, with a high rate of hospitalization among children, highlighting the persistent dangers of consuming unpasteurized dairy products even when regulated.
11:57 Top FDA Official Resigns Under Pressure: An update on the resignation of FDA official Dr. Vinay Prasad, who reportedly faced pressure after restricting the use of a novel gene therapy for Duchenne muscular dystrophy following patient deaths.
14:44 New CDC Director Confirmed: Dr. Susan Monarez has been confirmed by the Senate as the new CDC director. Dr. Griffin notes the vote was along party lines and that Dr. Monarez has walked back previous comments suggesting a link between vaccines and autism, now affirming there is no scientific evidence for such a link.
16:45 Poll Reveals Partisan Divide in Vaccine Trust: A KFF tracking poll shows that while most adults trust routine vaccines for measles (83%) and flu (74%), confidence in the COVID-19 vaccine is much lower (56%) and sharply divided along political lines. Doctors and pediatricians remain the most trusted sources for vaccine information.
22:05 Influenza Update & Promising Dual-Therapy Treatment: The last flu season resulted in 266 pediatric deaths, the majority in unvaccinated children. A new study on hospitalized patients with severe influenza found that combining baloxavir with a neuraminidase inhibitor (like Tamiflu) reduced mortality from nearly 12% to just 2% compared to using a neuraminidase inhibitor alone.
25:26 COVID-19 Trends May Be Leveling Off: Wastewater and hospitalization data suggest that the summer COVID-19 surge may be peaking and settling down, raising hopes for a shift towards a more predictable seasonal pattern.
26:39 Large Study Confirms Safety of Updated JN.1 COVID Vaccine: A robust Danish study of over 1.5 million people found no statistically significant increase in the risk of 29 different adverse events following vaccination with the JN.1-updated mRNA vaccine. The data showed a decreased risk for some conditions, such as a 60% reduction in pericarditis, reinforcing its safety.
32:33 Imaging Reveals Physical Abnormalities in Long COVID: A new study in the Journal of Nuclear Medicine used advanced imaging (PET/MRI) on patients with persistent cardiorespiratory symptoms after COVID-19. It revealed a high prevalence of objective physical damage, including pulmonary infiltrates, perfusion issues, and cardiac inflammation consistent with myocarditis and pericarditis, months after the initial infection.
36:45 Q&A: RSV Vaccine Safety in Pregnancy: In response to a listener question, Dr. Griffin clarifies that the RSV vaccine is still recommended for pregnant women in their third trimester to protect their infants. The initial concern about Guillain-Barré syndrome has not been a continued safety signal.
46:08 The Importance of Precise Scientific Communication: A listener provides a detailed statistical correction, noting that the flu vaccine is approximately 91% effective at preventing death in children, not 100%. Dr. Griffin agrees, emphasizing the importance of using precise language to maintain credibility and accurately convey the powerful, but not perfect, effectiveness of vaccines.