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citizenry who prefer to get the nasal spray version of the grippe vaccine , as opposed to the flu shot , will be out of luck next season : wellness officials say the nasal spraying should not be used this coming capitulation and winter .
The decision was based on new datum show that the os nasale spray was not very efficacious at preventing flu from 2013 to 2016,according to the Centers for Disease Control and Prevention . In fact , last grippe time of year ( 2015 to 2016 ) , the nasal flu vaccine had no protective welfare for child geezerhood 2 to 17 . In contrast , child who get a flu shot were 63 pct less likely to catch the flu than mass who were n’t immunise , the CDC said .
" We have to go with what the data says , " state Dr. Amesh Adalja , an infectious - disease specialiser and a elderly associate at the University of Pittsburgh Medical Center ’s Center for Health Security , who was n’t involved with the CDC conclusion , but supports the recommendation . " This vaccine is n’t as in force as we need , " at least based on data from the retiring few flu seasons , Adalja say . [ 6 myth About the Flu Vaccine ]
The nasal atomizer ’s depressed effectiveness is jolly surprising , experts say — in early studies , the spray performed just as well as , and sometimes better than , the flu shot . The nasal bone spray contains live , countermine flu viruses , which , in theory , can produce a stronger immune reaction than the vote out flu viruses that are in the influenza shot , the CDC say .
So why is n’t the nasal spray working well now ? Researchers do n’t eff for certain , but it could have to do with the strain of influenza that have been circulating in late twelvemonth . For the preceding several influenza time of year , thedominant grippe strain was H1N1 , the same tune that caused a flupandemicin 2009 . It ’s potential that the nasal spray is n’t very in force at protect against the H1N1 strain , Adalja say .
Other research supports this idea . A study published in thejournal Pediatrics in Januaryfound that the nasal atomizer forge just as well as the grippe shot at protect child from infection with the flu strain H3N2 and the flu barn strain during recent flu seasons . But Kyd who received the nasal spray were three times more likely to become infect with H1N1 than child who received the flu jibe , the written report happen .
This small strength of the os nasale spray " was unexpected , " the researchers said . The effect may have to do with the particular strain of H1N1 flu virus included in the nasal spray vaccine . Studies have found that this flu strain has a mutation that lowers its ability to cause contagion in animals , which could also reduce its ability to provoke a protective immune response .
In summation , this H1N1 stock may be more susceptible to degradation at gamy temperature , discipline have witness . Even though vaccines are refrigerated , they still can be exposed to high temperatures at some points during the transportation appendage , such as when they are unloaded from trucks or unpacked from their box , according to a 2015 presentation from MedImmune , the company that makes the FluMist os nasale spray . Thus , the greater susceptibleness of this virus to heat up could reduce vaccinum effectiveness , according to the presentation , and the researchers proposed tweaking the vaccinum to make it more heat - stable .
AstraZeneca , which owns MedImmune , aver in a statement today ( June 23 ) that other studies of FluMist conducted in the 2015 - to-2016 flu time of year have found that the nasal nebuliser was up to 58 percent effective at preventing grippe , and that the fellowship still plan to distribute the os nasale atomizer in other countries .
Theeffectiveness of the flu vaccinecan vary from time of year to time of year depending on a act of factor , admit which influenza viruses are circulating and how well the virus in the influenza vaccinum equalize those that are disperse , the CDC tell .
It ’s authoritative to note that the new recommendation against using the flu nasal spray is only for the upcoming 2016 to 2017 flu season , Adalja say . After that , the CDC will want to review new data point to see if it will keep or convert this passport .
The CDC recommend flu vaccine for everyone ages 6 calendar month and elderly . The federal agency say it will knead with vaccine manufacturers to assure that there is enough grippe vaccine to foregather demand this fall .
Original article onLive Science .
