Hudson’s Bay High School is the latest Clark County school to send letters home to parents after health officials confirmed cases of whooping cough.This week, Clark County Public Health confirmed two cases of whooping cough, or pertussis, at the Vancouver high school. Hudson’s Bay is the eighth local school since Oct. 1 to have identified cases of whooping cough, according to Clark County Public Health.Earlier this week, health officials confirmed multiple cases of whooping cough at Mountain View High School dating back to November. So far this year, nine cases have been reported at the east Vancouver school.Six other local schools each have one confirmed case of whooping cough: Mount Pleasant School, Henrietta Lacks Health and Bioscience High School, Riverview Elementary School, Union High School, Minnehaha Elementary School and Cascadia Technical Academy. Two Clark County residents at a Portland private school are also among the local cases of whooping cough.Clark County typically has nine to 16 cases of whooping cough each month. In November, four cases were reported locally. Health officials have recorded 20 cases so far this month.