Then the Lord will make thy plagues wonderful
 Visible, remarkable, distinguishable, and astonishing to all that see them: 
 and the plagues of thy seed;
 for they were to continue, as they have done, With their posterity, age after age: 
 [even] great plagues, and of long continuance;
 great as to quality and quantity, and firm, sure, lasting, and durable; the word used is rendered "sure" in ( Isaiah 55:3 ) ; sure by prophecy and in the event; and which when inflicted remained, as they have 1700 years; all which might be believed as certain, or what would certainly come to pass, and be depended on: 
 and sore sicknesses, and of long continuance;
 besides those diseases mentioned ( Deuteronomy 28:27 Deuteronomy 28:35 ) ; or however others including them.