Epidemiology

noun a highly contagious viral disease affecting cloven-hoofed animals such as cattle, sheep, and pigs

• Hoof-and-mouth disease is a highly contagious viral infection that affects cloven-hoofed animals.
• Farmers need to be vigilant in preventing hoof-and-mouth disease in their livestock.
• I heard there's an outbreak of hoof-and-mouth disease at the neighboring farm.
• The spread of rumors in the office was like a case of hoof-and-mouth disease, infecting everyone with gossip.

noun the condition of having a population larger than is deemed desirable or sustainable

• Overpopulation is a pressing issue that requires immediate attention from policymakers.
• The city is facing overpopulation problems, with more people moving in than moving out.
• Dude, the dorm room is way too crowded, it's like overpopulation in there.
• The garden became overpopulated with weeds, choking out the flowers.