Since when are diapers "Bio hazards?"?

I went to Wichita with my daughter, Corrie, for an ob/gyn appointment. I took care of the twins (9 months old) in the waiting room. There were several mothers and fathers there with babies of various ages.

I changed Kale’s diaper. It was just wet. I wrapped it up neatly and took it up to the front desk to ask the nice ladies if they had a trash can, as I didn’t see one in the waiting room.

In years past when that happened at other offices, they always took the diaper from me with a smile and said they’d take care of it and just toss it into the nearest can. If it was ‘dirty’ I’d always ask for a plastic bag to seal it in first.

This time, however, the receptionist looked at me with big eyes and said, “We have a trash can in the back here, down that hall.” It was obvious that she wanted me to walk it back there, which was behind a door and out of sight.

I said, “Is it very far away?” and indicated to my right (which she couldn’t see from her desk.)
She said, “Oh! You have a baby out here?”
I said, “Two.”
So she came around to the door and stood in the doorway looking at the twins, who were sitting on the floor, and she was saying, “Hi! Hello! Aren’t you cute!”

Then she told another gal to walk me back to one of the exam rooms that had a red trash can while the receptionist looked at the babies and talked baby talk.

This second gal walked me back, turned the corner to keep on walking who knows how far (and the twins are starting to cry) when I saw a red trash can in the exam room in front of me.
I said, “This one?”
She said, “That will work! I wasn’t sure which room she was talking about.”

The red trash can said, “Bio Hazard,” on it. I threw the diaper away then hurried back to the waiting room to quiet the twins down.

I have never experienced such paranoia in my life!

What was up with that?