Pennsylvania’s governor said there is no fetal tissue in the MMR shot, but official records show the rubella virus in that vaccine is grown using a human fetal-derived cell line.
Story Highlights
- Governor Josh Shapiro said the MMR vaccine contains no fetal tissue.
- Federal documents show rubella for MMR is grown in WI-38 human fetal-derived cells.
- Children’s Hospital of Philadelphia lists residual byproducts from those cells in MMR II.
- Robert F. Kennedy Jr. cited WI-38’s fetal origin while pressing the point online.
What Shapiro Claimed And Why It Sparked Pushback
Governor Josh Shapiro told the public, “There is no fetal tissue in the MMR,” while warning about vaccine “misinformation.” He shared an American Academy of Pediatrics message that says vaccines do not contain fetal cells and that purification removes fetal tissue. His post came amid measles concerns and framed critics as harming public health with false claims about ingredients. His statement triggered a narrow but important dispute over production methods versus finished contents.
Health and Human Services Secretary Robert F. Kennedy Jr. responded by pointing to the rubella component’s origin. He said Merck grows the rubella virus used in MMR II on WI-38 human diploid lung fibroblasts, which began from tissue of an aborted embryo in the 1960s. He argued that this history matters for people with moral or religious objections to abortion-linked products and that officials should be honest about how the product is made.
What The Official Records Actually Say About MMR II
The Food and Drug Administration package insert for M-M-R II states that the rubella virus strain is propagated in WI-38 human diploid lung fibroblasts. That establishes a clear link between rubella production and a human fetal-derived cell line. The Children’s Hospital of Philadelphia’s vaccine-ingredient page further notes that residual byproducts from WI-38 human cells can remain in MMR II, listing “proteins from cells used to grow virus (WI-38 human cells)” among other residuals from the manufacturing process.
Explainers from medical and science outlets agree on this production history while disputing looser words like “fetal tissue in the shot.” They confirm that rubella is grown in a fetal-derived line that traces back to the 1960s, while the finished vaccine contains the live attenuated viruses and small amounts of residual material from the cell substrate, not intact fetal tissue. This is the core distinction: made with a fetal-derived line versus contains fetal tissue.
The Moral And Policy Divide: Words, Transparency, And Choice
Shapiro’s message centers on the end product. He says the dose you receive does not contain fetal tissue. Kennedy’s point centers on the origin. He says the rubella virus is manufactured using a line that started with fetal tissue decades ago. Both claims can be read as true in their own lanes, but they answer different questions. People of faith often care how a product is made, not only what ends up in the vial.
For many Americans, this debate is not academic. They want straight talk and the freedom to decide. Clear labels and plain-language disclosures would help families weigh risks, benefits, and moral beliefs without spin. Federal and state leaders should respect conscience rights while keeping disease risks in view. Honest language builds trust; word games fuel doubt. A simple fix is to say: rubella in MMR is grown in a fetal-derived cell line; the final shot contains no intact fetal tissue.
Why Precision Matters Now
Public health officials often collapse complex facts into short slogans. That can backfire. When leaders say “no fetal tissue,” people who learn about WI-38 later feel misled. That opens the door to anger and refusal, even when the science on safety and effectiveness is strong. Precision protects trust. It also lowers the temperature by giving parents facts without shaming them for asking tough questions.
RFK Jr. Fact Checks Dem Governor:
Health and Human Services Secretary Robert F. Kennedy Jr. fact-checked Pennsylvania Democratic Gov. Josh Shapiro after he claimed that there is “no fetal tissue” in the measles, mumps, and rubella vaccine, known as MMR.https://t.co/SoQD5i4FEJ— Chet (@ChetRusinek) August 27, 2026
President Trump’s administration can set a better standard. Agencies can post clear, side-by-side summaries: how each vaccine is made, whether human fetal-derived cells are used, and what residuals testing finds. That approach respects life, faith, and liberty while avoiding fear. It also denies political cover to officials who dodge details. Americans deserve accurate, complete information so they can make informed choices for their families.
Sources:
cityandstatepa.com, knowyourvaccines.org, theconversation.com, nvic.org
