Is it HHV-6 or another pig virus?
"What is still unknown is whether the current Zika virus will behave
exactly the same in a different population with a different genetic and
immunity background, or whether a biological cofactor or co-infection is
responsible."
https://www.geneticliteracyproject.org/2016/04/12/beyond-microcephaly-can-zika-virus-cause-auto-immune-disorder-guillain-barre-syndrome/
https://www.geneticliteracyproject.org/2016/04/12/beyond-microcephaly-can-zika-virus-cause-auto-immune-disorder-guillain-barre-syndrome/