Oamenii de ştiinţă de la Institutul Naţional pentru Sănătate şi oficialii din domeniul sănătăţii din oraşul New York au studiat la microscop ţesuturi provenind de la 34 de persoane decedate ca urmare a gripei A/H1N1. Ei au descoperit „o serie de leziuni, atât la nivelul căilor respiratorii superioare, cât şi la cele inferioare”, a anunţat Jeffery Teubenberger, unul dintre autorii studiului.
În toate studiile traheea şi bronhiile prezintă semne de inflamare şi sunt uneori grav afectate. În 18 cazuri, adică mai mult de jumătate, au fost observate leziuni ale bronhiolelor, iar în 25 de cazuri, adică aproape trei sferturi din eşantion, chiar şi la nivelul alveolelor pulmonare.
Eşantionul studiat ilustrează în acelaşi timp şi una dintre particularităţile gripei A/H1N1, care afectează mai des tinerii decât persoanele în vârstă. O singură victimă studiată avea peste 60 de ani, iar 24 din 34 aveau mai puţin de 50 de ani.
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