public async Task <ActionResult <IEnumerable <Vaccine> > > GetVaccines()
        {
            var query  = new GetVaccinesQuery();
            var result = await _mediator.Send(query);

            return(Ok(result));
        }
        public async Task <List <Vaccine> > Handle(GetVaccinesQuery request, CancellationToken cancellationToken)
        {
            var model = await _repository.SelectAll <Vaccine>();

            return(model);
        }