God promised not to flood the entire planet again, he said nothing about smaller floods.
The second and final judgement is fire.
Here is how this world is going to end, not by a virus:
Men will flee to caves in the rocks and holes in the ground, away from the terror of the LORD and from the splendor of his majesty, when He rises to shake the earth
Isaiah 13:13 Therefore I will shake the heavens, and the earth shall remove out of her place, in the wrath of the LORD of hosts, and in the day of his fierce anger.
Behold, the LORD lays waste to the earth and leaves it in ruins. He will twist its surface and scatter its inhabitants--
Isaiah 34:4 And all the host of heaven shall be dissolved, and the heavens shall be rolled together as a scroll: and all their host shall fall down, as the leaf falleth off from the vine, and as a falling fig from the fig tree.
Lift up your eyes to the heavens, and look at the earth below; for the heavens will vanish like smoke, the earth will wear out like a garment, and its people will die like gnats. But My salvation will last forever, and My righteousness will never fail.
"For behold, the day is coming, burning like a furnace, when all the arrogant and every evildoer will be stubble; the day is coming when I will set them ablaze," says the LORD of Hosts. "Not a root or branch will be left to them."
Matthew 24:29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken: 30And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. 31And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
2 Peter 3:7 But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
2 Peter 3:10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
Revelation 6:12And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood; 13And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind. 14And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places. 15And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains; 16And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb: 17For the great day of his wrath is come; and who shall be able to stand?
Revelation 21: 1And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea. 2And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband. 3And I heard a great voice out of heaven saying, Behold, the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God. 4And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away.
5And he that sat upon the throne said, Behold, I make all things new. And he said unto me, Write: for these words are true and faithful. 6And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely. 7He that overcometh shall inherit all things; and I will be his God, and he shall be my son. 8But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.