syphilis

"The metal railing contracted slightly in the cold winter air. "

"The scientist examined the sample and found a bacterium, a tiny cell without a nucleus, under the microscope. "

"The doctor suspected a Treponema infection, given the patient's symptoms and recent travel history. "

"My aunt went to the clinic for a checkup because she wasn't feeling well. "

"She was worried about her son who had been sent off to fight in the war."

"Pit row was abuzz with activity."

"The children played outside without any supervision, leaving them unprotected from the traffic. "

"The fruit fly is a sexual, meaning it reproduces by exchanging genetic material with another fly. "

"The lightning caused thunder."

"The appointment was just for a checkup."

"The tomato plants had some kind of disease that left their leaves splotchy and fruit withered."

"The spread of the flu was rapid in the school this week. "