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We measure the effect of different public health regulations to the spread ofCOVID-19, based on a SEIRA model -- a SEIR model including asymptomatictransmissions. The cumulative confirmed cases and death show nonlinear positiverelationship with the value of asymptomatic rate. Based on this model, weanalyze the inhibit effects to COVID-19 of three types of public healthpolicies, i.e. isolation of laboratory confirmed cases, general personalprotection and quarantine (lock-down). The simulations conclude that theisolation display limited effects to the asymptomatic viral carriers. Thegeneral personal protection and quarantine perform similar effects when thetheir percentages of participants are same. When the total proportion ofasymptomatic, mild symptomatic and neglected patients is 40%, only depends onisolation policy may lead to an additional 75% infections, compared withgeneral personal protection or quarantine with an efficiency 80%. At end, weprovide seven recommendations of public health intervention before and duringan aerial transmitted epidemic (COVID-19).

Public Health Policy: COVID-19 Epidemic and SEIR Model with Asymptomatic Viral Carriers