Table 2. Screening of close contacts and secondary attack rate (SAR) from 2011 to 2016.

Year	Index cases	Screened cases		Close contacts	Screened close contacts		Secondary cases
		n	%		n	%	n	SAR (1/105)
2011	275	125	45.45	18214	7886	43.30	77	422.75
2012	269	251	93.31	15557	13535	87.00	43	276.40
2013	268	261	97.39	16837	15672	93.08	30	178.18
2014	221	218	98.64	24366	22669	96.38	43	176.48
2015	233	230	98.71	15878	15403	97.01	27	170.05
2016	239	237	99.16	17530	17043	97.22	15	85.57
Total	1505	1322	87.84	108382	92208	85.07	235	216.83