John Calvin Commentary Deuteronomy 28:61

"Also every sickness, and every plague, which is not written in the book of this law, them will Jehovah bring upon thee, until thou be destroyed." — Deuteronomy 28:61 (ASV)

Also every sickness and every plague. This passage confirms what I have said about the plague and the sickness, for the sickness stands first as the species, and then the plague follows, which has a wider meaning and encompasses all the curses in itself. Still, after he has listed so many forms of punishment, he declares that God is armed with yet other weapons to strike them; and surely, as His blessings are endless and innumerable, so also His power is incomprehensible for avenging contempt for His Law. Posterity has experienced, and we also, even now, partly perceive how true these threats were; for, as the obstinacy of men has burst forth and exalted itself more and more, so new and unheard-of punishments have abounded from God, like a deluge.