text: "We walked through a sewer opening and found something out of the ordinary?
classes:  No, delta strains are highly contagious and have a very strong virulence.  Besides, delta strains are highly contagious and have a very strong virulence.  Yes, delta strains are highly contagious and have a very strong virulence.  Meanwhile, delta strains are highly contagious and have a very strong virulence.