Vulnerable groups most likely to be seriously affected by COVID-19 are being advised to be extremely careful following a spike in cases on the island.The caution has come from the Barbados Association of Medical Practitioners (BAMP), which has expressed concern with the large number of positive cases registered in the last few days.With the Crop Over Festival having climaxed on Tuesday following the conclusion of Grand Kadooment and Soca on the Hill, health officials have seen a sharp increase in cases, coupled with a high positivity rate.While on Wednesday there were 325 positive cases recorded from just 693 tests, on Thursday those numbers more than doubled with 718 new cases being recorded from 1566 tests.