Laboratory reports of Haemophilus influenzae by age group and serotype: England and Wales, January to March 2014
Updated 27 February 2015
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In the first quarter of 2014 (January to March) there was a total of 206 laboratory reports of invasive Haemophilus influenzae. This represents an 8% increase in cases compared to the previous quarter (n=190) and a 7% decrease compared to the first quarter of 2013 (n=221). Of the samples which underwent serotyping (n=163), 87% were non-capsulated Haemophilus influenzae (ncHi), a further 12% were serotype a, e, or f, and 1% were serotype b (Hib). There was a single case of Hib reported this quarter compared to 7 reported in quarter 1 of 2013 when; 82% of serotyped samples were ncHi, 14% were serotype a, e, or f, and 4% were Hib.
Age-group was well reported (Table). Of the laboratory reports during the first quarter of 2014: 80% were aged 15 years and over; 14% were under 1 year of age; 4% were among 1 to 4 year olds; and 2% were aged 5 to 14 years. There was an increase to 29 Hi cases in the under 1 year of age- group compared to 18 (8%) confirmed in the first quarter of 2013. This increase was largely due to 23 cases of ncHi .in infants <1 year of age compared to 10 in the first quarter of 2013. Cases of ncHi were similar or lower in all other age groups in Quarter 1 of 2014 relative to the first quarter of 2013.
During quarter 1 of 2014 there were no cases of Hib in children under 15 years. In comparison, during the first quarter of 2013 one case of Hib was reported in a child under 15 years.
1. Age distribution of laboratory-confirmed cases of Haemophilus influenzae by serotype England and Wales, first quarter 2014 (2013)
| Serotype | Total, all quarters 2014 (2013) by age-group | Total, first quarter 2014 (2013) | ||||
|---|---|---|---|---|---|---|
| <1y | 1-4y | 5-14y | 15+ | nk | ||
| b | 0 (1) | 0 (0) | 0 (0) | 1(6) | 0 (0) | 1(7) |
| nc | 23(13) | 7 (6) | 3(4) | 109(119) | 0(1) | 142(143) |
| a,e,f | 3 (0) | 1(1) | 0 (0) | 16(24) | 0 (0) | 20(25) |
| not typed | 3(4) | 1(0) | 1 (2) | 38(40) | 0 (0) | 43(46) |
| Total | 29(18) | 9(7) | 4(6) | 164(189) | 0(1) | 206(221) |