In a statement, the Kapuso anchor said he is currently being treated for kidney disease and will also undergo a heart bypass surgery in mid-September.
Mayrina replaces former newsman Jiggy Manicad.
'Unang Hirit sa Holy Land' scored 1.8% versus ABS-CBN's 'UKG's 1.5% in AGB Nielsen's People Ratings measurements.
"Kung gusto i-bounce back ni Pangulong Duterte 'yung kanyang approval rating, dapat makita niya talaga [kung] ano ang gusto ng ibat-ibang sectors."
The move represents a homecoming for Araullo, who prior to becoming a household name at ABS-CBN hosted the now-defunct '24 Oras' segment 'ATOMic Sports.'