Yes,we are to expect various infectious diseases to continue...

Yes,we are to expect various infectious diseases to continue until God's Kingdom eradicates them.
Prophecy: “In one place after another pestilences.”—Luke 21:11.
Fulfillment: Despite medical advances, millions still die each year as a result of infectious diseases. International travel and the world’s growing urban population have increased the likelihood that disease outbreaks will spread rapidly.
● Smallpox killed an estimated 300 million to 500 million people in the 20th century.
● The Worldwatch Institute reports that during the past three decades, “more than thirty previously unrecognized diseases such as Ebola, HIV, Hantavirus, and SARS have emerged as new threats.”
● The World Health Organization has warned of the rise of drug-resistant germs, saying: “The world is heading towards a post-antibiotic era, in which many common infections will no longer have a cure and, once again, [will] kill unabated.”

Here's what God's Kingdom will bring:

(Isaiah 33:24) And no resident will say: “I am sick.” The people dwelling in the land will be pardoned for their error.

In fulfillment of Matthew 24:14, Jehovah’s Witnesses preach the good news of God’s Kingdom