Intended for healthcare professionals


Selection bias explains seasonal vaccine’s protection

BMJ 2009; 339 doi: (Published 07 December 2009) Cite this as: BMJ 2009;339:b5312

A percentage was wrong in the second paragraph of this letter by Naveed Z Janjua and colleagues (BMJ 2009;339:b4972, doi:10.1136/bmj.b4972). In the penultimate sentence (starting “Therefore, with a higher rate of chronic conditions...”) the final percentage should read “about 15%” (not “9%”) Also, references 5 and 6 were published the wrong way round (they should be switched).


Cite this as: BMJ 2009;339:b5312

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