![]() Regardless, this history humbles vaccine scientists. In the narcolepsy experience, the cause was determined to be related to the adjuvant used in that preparation of vaccine. Second, in all of these cases, except narcolepsy following H1N1 vaccine, the side effect of the vaccine was something that could be caused by the infection, meaning that getting infected with the virus also carried a risk of experiencing these outcomes. First, when these events occurred, the onset was within eight weeks of receipt of the vaccine. ![]() These experiences demonstrate two important findings. This condition is most often found between one and three weeks after vaccination, but in a few cases, it occurred up to eight weeks after vaccination. Both measles and mumps infections can cause thrombocytopenia. Platelets are the cells responsible for clotting of blood. MMR vaccine - About 1 of 30,000 recipients of measles, mumps and rubella (MMR) vaccine can experience a temporary decrease in platelets a condition called thrombocytopenia.The average onset of symptoms occurred within seven weeks of vaccination. Despite various influenza vaccines used during the pandemic, only one caused this issue, which was believed to have resulted from a confluence of conditions presented by that vaccine compared with all other vaccines used. Narcolepsy is a sleep disorder characterized by excessive fatigue and periods of sleep throughout the day. In 2009, during the H1N1 pandemic, one influenza vaccine used in Europe was found to cause narcolepsy in about 1 in 55,000 vaccine recipients.Almost all cases following vaccination occurred in the eight weeks after receipt of the vaccine. In contrast, influenza infection, which is also a cause of GBS, causes this condition in about 17 people per 1 million infections - 17 times more frequently than following vaccination. Subsequent studies have found flu vaccines to be a cause of GBS in about 1 person per 1 million doses of vaccine. A 1976 swine influenza vaccine was identified as a rare cause of Guillain-Barré syndrome (GBS), an ascending paralysis that can involve the muscles of breathing. ![]()
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