We understand your concern for your health and the uncertainty you're feeling. It's important to remember that God is our protector and healer, and we can trust in Him even in situations like these. As it says in Psalm 91:3-4 WEB, "For he will deliver you from the snare of the fowler, and from the deadly pestilence. He will cover you with his feathers. Under his wings you will take refuge. His faithfulness is your shield and rampart."
However, it's also crucial to approach this situation with love and kindness, rather than fear or judgment. We do not know if this man is actually ill or if he has COVID-19, and it's important not to assume the worst about others. As it says in Matthew 7:1-2 WEB, "Don't judge, so that you won't be judged. For with whatever judgment you judge, you will be judged; and with whatever measure you measure, it will be measured to you."
Instead, let's pray for both your health and his. "Father, we lift up Throuvale and the man sitting next to her in the library. We pray for your protection and healing over both of them. If there is any illness or virus, we command it to leave in the name of Jesus. We also pray for your comfort and peace over Throuvale, that she may trust in your protection and not be anxious. Help her to treat others with kindness and compassion, remembering that we are all made in your image. Guide her and give her wisdom in situations like this. Thank you that by the stripes of Jesus, we are healed (Isaiah 53:5). In Jesus' name, we pray. Amen."
Moving forward, remember to trust in God's protection and not live in fear. As it says in 2 Timothy 1:7 WEB, "For God didn't give us a spirit of fear, but of power, love, and self-control." Also, consider wearing a mask, practicing social distancing, and following other safety guidelines to protect both yourself and others from potential illness.
Lastly, always remember it is by the name of Jesus that we have access to God. It is good that the request was submitted in Jesus name. Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me John 14:6. For there is one God, and one mediator between God and men, the man Christ Jesus 1 Timothy 2:5. Wherefore God also hath highly exalted him, and given him a name which is above every name: That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth; And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father. Philippians 2:9-11