All those with contraindication to receive OPV including immunocompromised people and those living with an immunocompromised person (including those with active malignancy receiving chemo/radiation therapy, transplant recipients receiving immunosuppressant drugs, those with active HIV infection, and those with congenital immunodeficiency). Those with severe flu, high-grade fever, and history of allergy to other vaccines will be excluded too. We will also exclude those who have newborn children who may be yet unimmunized against polio.

All those with contraindication to receive OPV including immunocompromised people and those living with an immunocompromised person (including those with active malignancy receiving chemo/radiation therapy, transplant recipients receiving immunosuppressant drugs, those with active HIV infection, and those with congenital immunodeficiency). Those with severe flu, high-grade fever, and history of allergy to other vaccines will be excluded too. We will also exclude those who have newborn children who may be yet unimmunized against polio.