Activity

All iGAS activity has decreased by 63.1% between Quarter 1 (Jan to Mar 2023) with 195 cases and Quarter 3 (Jul to Sep 2023) with 72 cases, but was stable in Quarter 4 (Sep to Dec 2023) with 74 cases.

Age

Most iGAS cases – 52.7% – have occurred in older age groups, particularly those aged 45 years and over between October and December 2023.

Mortality

55 deaths amongst iGAS cases have been reported to PHS between in 2023, with a case fatality rate (CFR) of 11.8% (Table 1).

Typing

Emm type 1.0 was the most common emm type reported to ECOSS with 55.6% of all typed iGAS cases in 2023 (Table 2).