去看了下。临床2期，1500subjects 计划一年内完成。这里是对参与实验候选人的条件，，，

Inclusion Criteria:

• Exposure to a COVID19 case within 3 days as either a healthcare worker or household contact
• Provision of informed consent

Exclusion Criteria:

• Symptomatic COVID19 disease
• Current Symptoms of: Fever, Cough, or Shortness of Breath
• Contraindication or allergy to hydroxychloroquine
• Retinal eye disease
• Known glucose-6 phosphate dehydrogenase (G-6-PD) deficiency
• Known chronic kidney disease, stage 4 or 5 or receiving dialysis
• Weight < 40 kg
• Current use of: hydroxychloroquine or cardiac medicines of: flecainide, Tambocor; amiodarone, Cordarone, Pacerone; digoxin or Digox, Digitek, Lanoxin; procainamide or Procan, Procanbid, propafenone, Rythmal)