RT Journal Article SR Electronic T1 A 'herald wave' of type A influenza of the H1N1 sub-type. JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 475 OP 476 VO 36 IS 291 A1 J. Watkins YR 1986 UL http://bjgp.org/content/36/291/475.2.abstract AB