Software designed for direct-touch interfaces often utilize a metaphor of direct physical manipulation of pseudo "realworld" objects. However, current touch systems typically take 50-200ms to update the display in response to a physical touch action. Utilizing a high performance touch demonstrator, subjects were able to experience touch latencies ranging from current levels down to about 1ms. Our tests show that users greatly prefer lower latencies, and noticeable improvement continued well below 10ms. This level of performance is difficult to achieve in commercial computing systems using current technologies. As an alternative, we propose a hybrid system that provides low-fidelity visual feedback immediately, followed by high-fidelity visuals at standard levels of latency.

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The seroprevalence of antibody to severe acute respiratory syndrome (SARS)-associated coronavirus (SARS-CoV) in cohorts of health care workers (HCWs) with subclinical infection in SARS and non-SARS medical wards was 2.3% (3 of 131 HCWs) and 0% (0 of 192 HCWs), respectively. Rates for clinical SARS-CoV infection among 742 HCWs on these wards were highest among nurses (11.6%) and health care assistants (11.8%), indicating that these occupations are associated with the highest risks for exposure.