This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunization, Subject name: Pediatrics
Whole cell pertussis vaccine used to prevent infection can protect against? 
Select and explain. 
A. Bortedella parapertussis only, B. Mild forms of Bordetella pertussis only, C. Both Bordetella pertussis & parapertussis, D. Only against severe Pertussis
C: Both Bordetella pertussis & parapertussis
Answer: C: Both Bordetella pertussis & parapertussis 
Explanation: c. Both Bordetella pertussis & parapertussis(Ref: Clin Infect Dis. 2017Jun 15;64(12):1795-1797)Pertussis vaccine may induce cross-immunity & has been found to have 66%-82% effectiveness against parapertussis.Controversial; Some sources say: As measles can depress cell mediated immunity & as BCG induces cell mediated immunity BCG should not be given along with measles or MMR; while some do not comment about it; So, there is not much recent evidence to substantiate the same.