American Standard Version (ASV):
then Jehovah will make thy plagues wonderful, and the plagues of thy seed, even great plagues, and of long continuance, and sore sicknesses, and of long continuance.
King James Version (KJV):
Then the LORD will make thy plagues wonderful, and the plagues of thy seed, [even] great plagues, and of long continuance, and sore sicknesses, and of long continuance.