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Season starts in Nov so vaccine Sept to Nov
Types A, B and C with most being A or B

children vaccine is different to adults (live vs inactivated)

''Childrens ''
Intranasally, start at 2-3 years and continue annually
more effective than injectable
SE - headache, anorexia, rhinorrhoea
CI - immunocompromised,  <2yr, current fever or wheeze, egg allergy, aspirin, pregnancy/breast feeding

''Adults''
trivalent (2A+1B)
Indications - >65 plus
chronic resp disease (need inhaled steroids)
chronic heart disease (failure, IHD, HT if complicated)
CKD
chronic liver - cirrhosis, hepatitis, biliary atresia
chronic neuro - stroke / TIA
DM
Immunosuppressed
Asplenia
pregnancy
also - health care staff, those in residential homes, carers of elderly or disabled

vaccine 
inactivated (can't cause disease) - few pts get fever / malaise for 1-2/7
CI - egg allergy
75% effective (less in very elderly)
takes 10-14 days to get Ab level up