Isn't all this just common knowledge in T1D shouldn't need a citation to obvious stuff. The % is debatable but only depending on what country you're from. Type 1b is more common in some African nations. And a fall in autoantibodies is also obvious as the beta cells have been destroyed but gad65...
Some people with T1D are negative for GAD65 (GADA) but positive for other antibodies. But the majority are not. [1,2]
A small percentage (~5–10%) of people with clinically typical T1D are negative for all known antibodies — sometimes called “idiopathic type 1 diabetes.” This is usually called...