Table 2.

Laboratory results for measles-specific IgM antibody testing of suspected measles cases, seven southern African countries, 2009–2011.

		Suspected measles cases			Measles IgM laboratory test result									Rubella IgM laboratory test result
			Measles IgM tested		IgM +		IgM−		Indeterminate		Unknown		Positivity Ratea	Rubella IgM tested		Rubella IgM +
Country	Year	n	n	%	n	%	n	%	n	%	n	%	%	n	%	n	%
Botswana	2009	595	592	99	177	30	294	50	24	4	97	16	36	535	90	4	1
	2010	1411	1117	79	563	50	491	44	62	6	1	0	50	534	38	13	2
	2011	735	735	100	6	1	596	81	1	0	132	18	1	497	68	193	39
	Total	2741	2444	89	746	31	1381	57	87	4	230	9	34	1566	57	210	13
Lesotho	2009	189	189	100	20	11	166	88	3	2	0	0	11	188	99	73	39
	2010	2728	702	26	372	53	281	40	49	7	0	0	53	746	27	78	10
	2011	169	150	89	0	0	150	100	0	0	0	0	0	150	89	78	52
	Total	3086	1041	34	392	38	597	57	52	5	0	0	38	1084	35	229	21
Malawi	2009	529	528	100	16	3	511	97	1	0	0	0	3	316	60	40	13
	2010	109,267	852	1	370	43	477	56	0	0	5	1	44	851	1	26	3
	2011	659	651	99	21	3	630	97	0	0	0	0	3	651	99	223	34
	Total	110,455	2031	2	407	20	1618	80	1	0	5	0	20	1818	2	289	16
Namibia	2009	2716	951	35	344	36	522	55	61	6	24	3	37	802	30	25	3
	2010	2234	698	31	167	24	489	70	42	6	0	0	24	622	28	157	25
	2011	875	854	98	59	7	453	53	9	1	333	39	11	852	97	134	16
	Total	5825	2503	43	570	23	1464	58	112	4	357	14	27	2276	39	316	14
South Africa	2009	15,246	15,204	100	6086	40	8559	56	559	4	0	0	40	15,215	100	3009	20
	2010	23,264	16,189	70	11,904	74	4028	25	0	0	257	2	75	5910	25	1236	21
	2011	8632	8610	100	116	1	8460	98	34	0	0	0	1	8590	100	3226	38
	Total	47,142	40,003	85	18,106	45	21,047	53	593	1	257	1	46	29,715	63	7471	25
Swaziland	2009	240	240	100	16	7	223	93	1	0	0	0	7	240	100	135	56
	2010	769	617	80	301	49	311	50	5	1	0	0	49	614	80	94	15
	2011	77	77	100	0	0	77	100	0	0	0	0	0	77	100	19	25
	Total	1086	934	86	317	34	611	65	6	1	0	0	34	931	86	248	27
Zimbabwe	2009	853	401	47	127	32	264	66	6	1	4	1	32	351	41	29	8
	2010	9762	1468	15	600	41	836	57	32	2	0	0	41	482	5	97	20
	2011	876	875	100	0	0	873	100	2	0	0	0	0	873	100	448	51
	Total	11,491	2744	24	727	26	1973	72	40	1	4	0	27	1706	15	574	34
Total		181,826	51,700	28	21,265	41	28,691	55	891	2	853	2	42	39,096	22	9337	24

^aThe number of IgM+ divided by the number with a known test result.