Multiple laboratory tests were done at this time to look for possible viral diseases, toxins, or clotting abnormalities. Findings from tests for herpes simplex viruses 1 and 2, measles, cytomegalovirus, varicella-zoster virus, and Epstein-Barr virus were negative, and the examination of the cerebral spinal fluid gave normal results. The VDRL test findings were negative. Test results for anti-cardiolipin antibodies and an anti-nuclear antibody were negative. The levels of folate, vitamin B12, thyroxine, and triiodothyronine were normal. Toxicology screening was positive for ethanol at 103.2 mg/dL, but it was negative for benzodiazepines, opiates, salicylates, acetaminophen, tricyclic antidepressants, stimulant amines, cocaine, and barbiturates.