我这些天有好几个80岁以上的病人，除了low degree fever，没有其他typical covid symptoms, 基本都是supportive treatment，预防并发症，和缓解症状治疗，大部分几天能安全出院。
一个81岁的老奶奶，症状严重，发病早期给了Remdesivir x 5 days ; 另一个40多岁的墨兄，SOB 严重，血氧低，错过了Remdesivir最佳期，给了convalescent plasma 。
有症状的病人，如果Rapid test 是阴性，我们会做second test，因为如果 viral load 不够，会呈false negative。 如果病人present病程超过7天，我们会order PCR test。The duration of viral shedding varies significantly and may depend on severity (based on testing of oropharyngeal samples ranged from 8-37 days, with a median of 20 days),
即便Rapid 和 PCR 都呈阴性，CXR 显示有不正常发现（Patchy ground glass opacities), 我们会把病人做PUI 处理，一样隔离和治疗。 而且会重复CXR，因为Early in the course of the disease, there are many mildly symptomatic patients with clear chest x-rays that quickly progress over days to patchy ground glass opacities.
有的症状病人，Case-by-case，同时还会做respiratory viral panel, strep throat 和其他Labs；根据病情，有的也会做Antibody Test (IgM, IgG , but It is not necessarily confer immunity to COVID-19 and it is unknown how long antibodies last）
PS，
阎老在症状几天后，检测 covid test negative，based on cases and studies，采样的viral loading dose应该合适，采样的技术问题除外。
阎老，也许是flu造成的心肌炎导致直接死亡。 Acute myocarditis is a well-known complication of influenza infection。 Myocarditis can be life-threatening if not treated in time。（我不知道阎老病程的具体细节，无法判断）
R.I.P，阎老！
补充一个Research information for PCR test
Over the 4 days between infection (day 1) to the typical time of symptom onset (day 5), the probability of a false-negative result in an infected person decreased from 100% on day 1 (95% CI, 100%-100%) to 67% (CI, 27% - 94%) on day 4.
On the day of symptom onset (day 5), the median false-negative rate was 38% (CI, 18% to 65%).
On day 8 the median false-negative rate decreased to 20% (CI, 12%- 30%), and then began to increase again (21% [CI 13%-31%] on day 9). On day 21 the median false negative rate was 66% (CI, 54% -77%).
