What is the meaning of "no contagion," and did the Prophet (peace and blessings be upon him) deny contagion?

The questioner : The hadith I mentioned a moment ago is the hadith of the camels and their contagion. Does it confirm the existence of contagion, but that one should guard against it? Because the Messenger (peace and blessings be upon him) did not deny contagion when he was asked; he said, "The leper enters the camels and infects them." He did not deny contagion at all, but he said, "Then who infected the first one?" This is a confirmation that contagion comes from Allah.

The Shaykh : Yes, that is correct.

The questioner : So what is the ruling regarding it, then?

The Shaykh : But we discussed it yesterday; in fact, this hadith passed by us yesterday, meaning we spoke about it. This is a digression. We said, as you said, that the Messenger (peace and blessings be upon him) did not deny contagion, but he informed that it is by the command of Allah. For this reason, he ordered fleeing from the leper.