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# 50 Years Ago: Apollo 13 and German Measles

### John Uri

#### Johnson Space Center

Apr 02, 2020

Article

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#### ***Or how a 3-year-old boy changed NASA’s plans for Apollo 13***

The last few days before launch Apollo crews typically finished up any last minute training and also found time to get a little rest before the big day. Not so much with Apollo 13, scheduled to lift off on April 11, 1970. As the prime crew of Commander James A. Lovell, Command Module Pilot (CMP) Thomas K. “Ken” Mattingly, and Lunar Module Pilot (LMP) Fred W. Haise and backups John W. Young, John L. “Jack” Swigert, and Charles M. Duke finished training, one astronaut’s illness exposed the rest to an infectious disease resulting in an unprecedented change of crewmembers two days before launch. Meanwhile, at Kennedy Space Center (KSC), on April 5 engineers began the extended countdown for the launch of Apollo 13, with the terminal countdown beginning April 10, preparing the Saturn V rocket and the Apollo spacecraft for the launch and trip to the Moon. Initial steps included loading kerosene fuel into the rocket’s first stage and activating the Command and Service Module to begin the checkout of the spacecraft’s systems.

*Left: Original Apollo 13 crew (left to right) Haise, Lovell and Mattingly posein front of their Saturn V rocket. Right: The Apollo 13 Saturn V on theeve of the launch.*

After participating in the Countdown Demonstration Test (CDDT) on March 26, the astronauts resumed their training in the final two weeks before launch. Lovell, Haise, Young and Duke finished their final training for the lunar surface Extra-Vehicular Activities (EVAs), Young completed his last training flights in the Lunar Landing Training Vehicle (LLTV), and all spent time in the Command Module (CM) and Lunar Module (LM) simulators and reviewing procedures and the overall flight plan. They also maintained their flying skills during flights aboard T-38 Talon jets. The orderly sequence of events was disturbed when Duke fell ill on Sunday April 5, just six days before the planned liftoff.

*Left: Haise (left) and Lovell during EVA training at KSC.Right: Duke (at left) and Young training for a lunar surface EVA.*

*Left: Lovell descending the stairs from the LM simulator at KSC.Middle: Haise inside the LM simulator at KSC.Right: Mattingly (left) and Lovell inside the CM simulator at KSC.*

*Left: Lovell preparing for a training flight in a T-38.Middle: Haise preparing for a training flight in a T-38.Right: Mattingly (left) and Swigert share a lighthearted moment during training.*

Three weeks before the planned April 11 liftoff, backup LMP Duke and his family spent time with friends whose 3-year-old son came down with German measles, also known as rubella, the following week. Because Duke didn’t have German measles as a kid, he lacked immunity against the rubella virus and came down with the disease. Duke had trained together and attended meetings with the other five crewmembers up until Friday April 3, while he was still contagious. During the crewmembers’ L-5 day physical exams on Monday April 6, the flight surgeon collected blood samples and analyzed them to see if any of the astronauts had antibodies against rubella although none except Duke exhibited any symptoms. The test results came back two days later with good news for Lovell and Haise, who had immunity probably from childhood exposures, but Mattingly did not. Young and Swigert on the backup crew were also immune. Dr. Charles A. Berry, Director of Medical Research and Operations at the Manned Spacecraft Center, now the Johnson Space Center in Houston, was concerned that if Mattingly were to come down with German measles, given the virus’ incubation period it would likely be around the time they were in lunar orbit, possibly while he was alone in the CM. Symptoms such as fever, rash and headache could interfere with his ability to perform intricate maneuvers to rendezvous with Lovell and Haise in the LM as they returned from the Moon.

*Left: Management meeting at KSC on April 10 during which the decision was madeto swap Swigert for Mattingly. Right: Press conference on April 10 to announcethe crew swap decision.*

Apollo program managers now faced a dilemma. No one wanted a sick astronaut during a critical phase of the mission. One option was to delay the flight by 28 days to the next launch window in May 1970 that allowed a landing at the same Fra Mauro site with the same lighting conditions, but that was a costly proposition. Flying the entire backup crew was not an option since Duke would still be symptomatic at launch time. The only solution that made sense was to ground Mattingly and fly Swigert in his place. The backup crew typically trains to be ready to fly the mission until about one month before launch, when the prime crew has almost exclusive access to the spacecraft simulators. While managers considered Swigert fully trained, he might have been a little rusty, so he began an intensive last-minute refresher training program on CM systems. Fortunately, over the past few years, Swigert had developed the CM malfunction procedures, so he knew that spacecraft’s systems probably better than any other astronaut. His proficiency satisfied managers that he could operate the spacecraft with no issues. Another concern raised was that Swigert hadn’t trained directly with Lovell and Haise and would the three form a cohesive crew. During several simulator runs, the three proved they could precisely execute intricate maneuvers as a team. Chief of Flight Operations Donald K. “Deke” Slayton agreed that Swigert was a proficient and well-integrated member of the crew and that the safest course of action was to ground Mattingly and fly Swigert in his place. During a press conference on April 10, the day before liftoff, Thomas O. Paine, NASA Administrator, announced the decision.

*Left: Preflight meeting to discuss the crew change with (left to right) Slayton, Lovell,Mattingly and Swigert. Right: The new Apollo 13 crew of (left to right)Swigert, Lovell and Haise.*

*Left: Original plaque bearing Mattingly’s signature mounted on theLM landing leg strut. Right: A replica of the replacementplaque bearing Swigert’s signature.*

Engineers had one more unplanned task to accomplish. The plaque that they had affixed to the LM’s landing strut to commemorate the Apollo 13 lunar landing bore Mattingly’s signature. With Swigert taking his place, workers quickly manufactured a new plaque with the new CMP’s signature and flew it to KSC, stowing it inside the CM. Lovell and Haise planned to transfer it to the LM and attach the revised plaque to the landing strut once on the lunar surface.