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Table 2 The proportions of travellers positive in high and low risk countries determined using cut-off levels for R 0 when R 0 was estimated using t = 10, 16 and 23 days. Note that data from Saint Lucia and Curacao were not used to estimate proportions when R 0 was estimated using t = 10 and 23 days

From: Risk of travel-related cases of Zika virus infection is predicted by transmission intensity in outbreak-affected countries

t-value used to estimate R 0 Cut-off for R 0 used to determine high and low risk countries Proportion (%) positive in ‘high risk’ group Proportion (%) positive in ‘low risk’ group
10 days 1.98 86/1480 (5.8) 5/2042 (0.2)
16 days 2.76 67/596 (11.2) 25/2955 (0.1)
23 days 3.30 67/596 (11.2) 24/2905 (0.1)