“A aparut primul caz de gripa din acest sezon”. Asa suna, in fiecare an, anuntul facut de Centrul National de Referinta pentru Gripa din Institutul Cantacuzino. Ce inseamna concret acest lucru? Este rezultatul unor serii complexe de analize si teste la finalul carora sunt identificate tipurile de virusi care-i chinuie pe romani in sezonul rece.
Anul acesta, spun specialistii, gripa e putin “intarziata” in Romania. Cel mai puternic val de gripa s-a inregistrat acum doi ani, cand primele cazuri au aparut inca din octombrie. “Suntem in a opta saptamana de supraveghere si abia acum a aparut primul caz de gripa confirmat la om. Asta nu inseamna ca virusii gripali nu circula. Cel pe care l-am identificat noi este insa asemanator cu tulpina care se afla in vaccin”, ne-au precizat specialistii din cadrul Centrului National de Referinta pentru Gripa.
Ce inseamna de fapt ca “a fost identificat un virus gripal?” Inseamna ca cercetatorii au incheiat o serie de analize si teste sofisticate. Concret, in Romania exista 19 judete care formeaza asa-numitul “sistem santinela”, ce poate declansa o alarma privind epidemia de gripa. “Avem medici de familie care raporteaza cati pacienti cu astfel de afectiuni au avut, serviciile de ambulanta care centralizeaza numarul acestor cazuri, farmacii in care se monitorizeaza consumul de medicamente specifice si spitale in care se urmareste numarul de internari. O data cu inceperea sezonului gripei, la Institut sunt trimise mostre pe care noi le studiem pentru a stabili daca pacientul respectiv are virus gripal”.
In acest “sezon” au fost analizate in Institut circa 100 de probe de la pacienti cu suspiciune de gripa. Cum se fac analizele? Se recolteaza de la pacienti o serie de secretii din nas si gat, care sunt supuse unor teste. Exista testul rapid, care da rezultate in circa o jumatate de ora – o ora. “Dintre probele supuse testelor rapide, doar la o parte continuam analizele, adica la cele unde ramane suspiciunea de gripa. Acestea sunt trecute pe asa-numitele „culturi celulare”, care confirma intr-adevar tipul de virus”, spun specialistii. In plus, se mai fac si alte teste, necesare pentru raportarile pentru OMS, privind formula vaccinului antigripal pentru urmatorul sezon. Pentru asta, e nevoie de oua. In aceste oua se injecteaza, cu niste instrumente speciale, o parte din mostrele de secretii primite de la pacienti. Urmeaza apoi 72 de ore in care ouale trebuie sa stea in termostat. Dupa acest interval, in care se poate dezvolta virusul in embrionul respectiv, ouale se scot din „hota de lucru” si se recolteaza din continutul acestora celule in care s-a dezvoltat virusul.
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