Introduction
The question "did Ken Mattingly get the measles" sits at the center of one of the most dramatic personnel decisions in the history of spaceflight. The short answer is **no, Ken Mattingly never contracted the measles (rubeola), nor did he contract German measles (rubella), despite being exposed to them shortly before the launch of Apollo 13.Also, ** This single medical determination triggered a cascade of events that removed him from the prime crew just 72 hours before liftoff, replacing him with Jack Swigert. Because of that, while Mattingly avoided the illness entirely, the decision to ground him became a defining moment in NASA history, indirectly shaping the successful recovery of the crippled Apollo 13 spacecraft. Understanding this story requires separating the medical facts from the mission mythology, exploring the specific virus involved, the immunity protocols of the era, and the profound consequences for the crew and mission control.
Detailed Explanation
The Medical Scare: Rubella, Not Rubeola
To understand the situation accurately, a crucial medical distinction must be made. The virus that threatened the Apollo 13 crew was rubella (commonly known as German measles or three-day measles), not rubeola (standard measles). While both cause rashes and fever, they are caused by different viruses and carry different implications for adults. In early April 1970, Charles Duke, a member of the Apollo 13 backup crew (and future Apollo 16 moonwalker), contracted rubella from one of his children. Because the prime and backup crews trained in close proximity, the entire Apollo 13 prime crew—Jim Lovell, Fred Haise, and Ken Mattingly—had been exposed.
NASA’s Immunity Protocols and the Flight Surgeon’s Dilemma
NASA flight surgeons faced a high-stakes dilemma. The incubation period for rubella is typically 14 to 21 days. Apollo 13 was scheduled to launch on April 11, 1970, placing the potential onset of symptoms right in the middle of the mission timeline. If an astronaut developed rubella in space, the consequences could be severe: high fever, rash, joint pain, and encephalitis risks in a microgravity environment with limited medical capabilities. Beyond that, a sick astronaut could compromise the mission’s critical operations Nothing fancy..
The flight surgeons checked the immunity status of the prime crew. Think about it: blood tests revealed that **Jim Lovell and Fred Haise had antibodies indicating prior exposure and immunity. In practice, ** Ken Mattingly, however, had no detectable antibodies. He was seronegative, meaning he had never had rubella nor been vaccinated (the vaccine had only been licensed in the US in 1969 and was not yet standard for adults). Because Mattingly was the only non-immune member of the prime crew, he was the sole astronaut at risk of developing the active disease during the flight Turns out it matters..
The official docs gloss over this. That's a mistake.
Step-by-Step or Concept Breakdown
The Decision to Pull Mattingly
The decision process moved with ruthless efficiency over the weekend of April 4–5, 1970 Small thing, real impact..
- Exposure Confirmed: Duke’s diagnosis was confirmed on Saturday, April 4.
- Immunity Testing: Blood samples from the prime crew were rushed to the lab.
- Results Returned: By Sunday, April 5, results showed Mattingly lacked immunity.
- Management Review: Deke Slayton (Director of Flight Crew Operations) and Dr. Charles Berry (Director of Medical Research and Operations) presented the case to NASA management.
- The Verdict: Despite the mission being days away, the risk was deemed unacceptable. Mattingly was officially pulled from the prime crew on Monday, April 6—72 hours before launch.
The Replacement: Jack Swigert
With Mattingly grounded, the Command Module Pilot (CMP) seat went to John L. "Jack" Swigert Jr., a member of the Apollo 13 backup crew. Swigert had trained extensively alongside Mattingly and was fully qualified, but the swap introduced significant disruption. The prime crew had developed a specific rhythm, shorthand, and trust over months of simulation. Swigert had to integrate instantly into the most demanding role on the spacecraft—managing the Command Module Odyssey’s guidance, navigation, and life support systems—while the crew scrambled to re-validate procedures in the final days Surprisingly effective..
The Quarantine and Monitoring
Following his removal, Mattingly was not simply sent home. He was placed under strict medical observation (quarantine) for the duration of the incubation period. Flight surgeons monitored his temperature and health daily, watching for the telltale maculopapular rash, lymphadenopathy (swollen lymph nodes), or fever that would signal the onset of rubella. The days passed—April 11 (launch), April 13 (the explosion), April 17 (splashdown)—and Ken Mattingly never developed a single symptom. He remained perfectly healthy throughout the entire crisis That's the part that actually makes a difference. Simple as that..
Real Examples
The "What If" Scenario: Mattingly on Apollo 13
Historians and engineers often simulate the "Mattingly Scenario." Had Mattingly flown and not gotten sick, the mission would have proceeded with the original crew. Still, the critical moment occurred after the oxygen tank explosion on April 13. The Command Module Odyssey was powered down to save battery power for re-entry, and the crew moved into the Lunar Module Aquarius as a "lifeboat."
The procedure to power Odyssey back up for re-entry had never been done in flight. Plus, it required writing entirely new checklists in real-time, managing extremely limited power and water budgets, and executing a precise sequence of switch throws. Ken Mattingly was the undisputed expert on the Command Module systems. Because he had been pulled, he was sitting in the simulators at Mission Control in Houston, not freezing in a dead spacecraft 200,000 miles away. He spent the crisis working 20-hour days, leading the team that wrote the re-entry power-up checklist. His intimate knowledge of every circuit breaker, voltage limit, and thermal constraint was the primary reason the checklist worked flawlessly. If he had been in the spacecraft, there would have been no one on the ground with his depth of systems knowledge to guide the crew through the unprecedented startup.
The Apollo 16 Redemption
Ken Mattingly did not have to wait long for his own flight. He was reassigned as Command Module Pilot for Apollo 16, which launched in April 1972. This mission was a resounding success. Mattingly performed a deep-space EVA (Extravehicular Activity) to retrieve film cassettes from the Scientific Instrument Module bay on the return trip from the moon, becoming one of only three humans to perform a spacewalk in deep space (cislunar space). His performance on Apollo 16 validated NASA's faith in him, proving that the Apollo 13 removal was a bureaucratic/medical necessity, not a reflection of his skill Small thing, real impact..
Scientific or Theoretical Perspective
Rubella Virology and Adult Morbidity
From a virological standpoint, NASA’s caution was scientifically sound. Rubella is caused by a togavirus (genus Rubivirus). While often mild in children, rubella in adults frequently presents with significant morbidity. Adult patients commonly experience:
- Arthralgia and Arthritis: Joint pain and swelling (particularly in fingers, wrists, and knees) occurring in up to 70% of adult women and a significant percentage of adult men. This can last for weeks.
- Encephalitis: A rare but serious complication (approx. 1 in 6,000 cases) causing brain inflammation.
- Thrombocytopenia: Low platelet count leading to bleeding risks.
- Prolonged Constitutional Symptoms: Fever, malaise, and headache lasting
months. These complications are far less common in children, whose immune systems often clear the virus without severe consequences. Even so, for NASA, the stakes were existential: a crew member incapacitated by prolonged illness during a mission could jeopardize the entire operation, as Apollo 13’s success hinged on a fully functional three-person team. The agency’s decision to ground Mattingly aligned with virological principles, prioritizing mission safety over individual ambition Easy to understand, harder to ignore..
The Apollo 16 Redemption
Ken Mattingly did not have to wait long for his own flight. He was reassigned as Command Module Pilot for Apollo 16, which launched in April 1972. This mission was a resounding success. Mattingly performed a deep-space EVA (Extravehicular Activity) to retrieve film cassettes from the Scientific Instrument Module bay on the return trip from the moon, becoming one of only three humans to perform a spacewalk in deep space (cislunar space). His performance on Apollo 16 validated NASA’s faith in him, proving that the Apollo 13 removal was a bureaucratic/medical necessity, not a reflection of his skill Small thing, real impact. Simple as that..
Scientific or Theoretical Perspective
From a virological standpoint, NASA’s caution was scientifically sound. Rubella is caused by a togavirus (genus Rubivirus). While often mild in children, rubella in adults frequently presents with significant morbidity. Adult patients commonly experience:
- Arthralgia and Arthritis: Joint pain and swelling (particularly in fingers, wrists, and knees) occurring in up to 70% of adult women and a significant percentage of adult men. This can last for weeks.
- Encephalitis: A rare but serious complication (approx. 1 in 6,000 cases) causing brain inflammation.
- Thrombocytopenia: Low platelet count leading to bleeding risks.
- Prolonged Constitutional Symptoms: Fever, malaise, and headache lasting
Conclusion
The Apollo 13 crisis underscored the delicate interplay between human expertise, technological precision, and biological vulnerability. Ken Mattingly’s role in Apollo 16 not only redeemed his career but also highlighted the irreplaceable value of specialized knowledge in high-stakes environments. Meanwhile, NASA’s decision to ground him during Apollo 13 reflected a pragmatic understanding of virology and risk management, ensuring the mission’s survival over individual opportunity. Together, these narratives illustrate how science, human resilience, and institutional judgment converge to handle the unknown Nothing fancy..
