Vaccines & Immunity Brief2026-10-19Flu positivity jumps to 5.0%, measles reaches 4,410, and Pennsylvania investigates a sixth death: this week's vaccine planFlu test positivity rose to 5.0% in the week ending October 10 and confirmed measles cases reached 4,410, while a new federal study measured how well the whooping-cough series protects young children; this week's brief sets out what a household should book now and what is worth waiting for.
Vaccines & Immunity Brief2026-10-12Measles passes 4,000 and Pennsylvania counts a fifth death, flu positivity at 3.6%: this week's vaccine planWith flu test positivity climbing a fifth straight week to 3.6% and U.S. measles cases passing 4,000, this week's brief weighs a new comparison of high-dose and standard flu shots for older adults and lays out what a household should book now.2
Vaccines & Immunity Brief2026-10-05Measles deaths at two nationally and four in Pennsylvania, and flu positivity at 3.4%: this week's vaccine planCDC's national measles page now lists two deaths for 2026 while Pennsylvania counts four, and flu test positivity rose a fourth straight week to 3.4%; this week's brief explains what the numbers change for a household's next appointment.1
Vaccines & Immunity Brief2026-09-28Four measles-associated deaths in Pennsylvania, and flu positivity at 2.7%: this week's planPennsylvania has now confirmed four measles-associated deaths and CDC's national page lists a 2026 measles death, while flu test positivity climbed to 2.7%; this week's brief explains what each number changes for a household's next appointment.1
Vaccines & Immunity Brief2026-09-21Flu positivity rose to 1.8% and measles reached 3,471: what to book this weekThis week's flu report shows the season's first real uptick at 1.8% test positivity, measles reached 3,471 cases even as the weekly curve slowed, and last season's effectiveness figures show what this year's updated trivalent shot can realistically do.1
Vaccines & Immunity Brief2026-09-14Flu activity stays low as measles cases climb: the mid-September vaccine checklist for U.S. familiesWith national flu activity remaining quiet and confirmed measles cases climbing to 3,294, mid-September is the ideal window for U.S. families to audit immunization records and book autumn trivalent shots.1
Vaccines & Immunity Brief2026-09-07The flu vaccine window is open: what U.S. families should schedule this weekCDC's latest flu data remains low, but September is the time to check records and book fall vaccination rather than wait for a new effectiveness estimate or product announcement.3
Vaccines & Immunity Brief2026-08-312,903 measles cases, low flu activity: the fall vaccine decisions for U.S. familiesA plain-language guide to the latest measles and flu data, Pfizer's new XFG approval, and what this week's immune-system research changes for household planning.2
Vaccines & Immunity Brief2026-08-242,777 measles cases, low flu activity: the fall vaccine checklist for U.S. familiesCDC's latest measles count makes record checks urgent while low flu activity leaves U.S. families time to schedule fall vaccination and understand what new research can—and cannot—change.2
Vaccines & Immunity Brief2026-08-17The mRNA flu shot's 26.6% edge: useful evidence, not a reason to waitA new NEJM comment puts Moderna's phase 3 mRNA flu data in context: plan fall vaccination around real access and age, rather than waiting for a product or effectiveness estimate that CDC has not posted.2
Vaccines & Immunity Brief2026-08-10Moderna's mRNA flu shot is approved. What U.S. families should do nowModerna's mFLUSIVA is approved for adults 50 and older, but the immediate family plan is still to check MMR records and book fall flu care without assuming the new shot is already stocked.
Vaccines & Immunity Brief2026-08-03Measles reached 2,371. The back-to-school vaccine check is now the priorityCDC's July 30 measles update makes an MMR record check the immediate family task, while low summer flu activity leaves most households time to plan fall shots without waiting on a new product.