कोविड -19, शब्द बादल, वाइरस, महामारी, सर्वव्यापी महामारी, निषेधाज्ञा, न्यूनतम दूरी, संपर्क पर प्रतिबंध, रोगी शून्य, ऊष्मायन अवधि, नश्वरता
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