Table.1.

Proportion of cases and not cases with each combination of symptoms

	Symptom combination
Status	A|Z|C|B|T	A|D|H|M|W	G|A|V|P|J
% confirmed cases with symptoms (N)—i.e. sensitivity	92.2% (1037)	77.2% (868)	39.3% (442)
% not a case without symptoms (N)—i.e. specificity	8.0% (380)	67.4% (3203)	92.9% (4415)
% not a case with symptoms (N)—i.e. false + ves	92.0% (4370)	32.6% (1547)	7.1% (335)
Total number recommended for PCR	5407	2415	777
Number cases not recommended for PCR	88	257	683

Here sensitivity and specificity are calculated using ‘status’ as a quasi-gold standard