PUT THERE IS/There are constructions 1)......a regular programmer of immunization in our country 2).....a lot of patient at the infectious disease hospital

1) There is a regular programmer of immunization in our country.
2) There are a lot of patients at the infectious disease hospital.
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В первом there is, потому что единственное число — a regular programmer.
Во втором there are, потому что множественное число — a lot of patients (много пациентов).