Virusuri periculoase
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Virusuri periculoase

Exista virusuri care in fiecare an provoaca moartea a milioane de oameni de pe intreaga planeta. Unul dintre cele mai periculoase este Ebola, care provoaca febra hemoragica. Se transmite prin sange, lichid seminal si saliva si are o rata de mortalitate de 90%. Din fericire, Romania este ocolita de acest virus, majoritatea cazurilor fiind semnalate pe continentul african. 

Pe teritoriul nostru, cele mai periculoase virusuri sunt HIV si virusurile hepatice B si C, din cauza  complicatiilor pe termen lung. Datele statistice arata ca in Romania sunt peste 10.000 de persoane infectate cu HIV si peste 2 milioane de bolnavi de hepatita B si hepatia C, dar medicii sustin ca numarul real este mai mare.

Aceste virusuri sunt periculoase, mai ales atunci cand nu sunt depistate la timp. In cazul infectiei cu HIV, sistemul imunitar slabit favorizeazasi aparitia altor boli, precum pneumonia sau cancerul. Speranta de viata in cazul unei persoane infectate cu HIV este de 23 de ani.

In cazul virusurilor hepatitice B si C, dupa aproximativ 12 ani, boala netratata se cronicizeaza si duce la afectiuni mai grave ale ficatului, precum ciroza si cancerul hepatic. Virusurile hepatice B si C se transmit prin contactul cu fluide contaminate (saliva, secretii, sange). 

Principala armade aparare a organismului in lupta cu infectiile virale este imunitatea celulara, asigurata de limfocitele T si NK (natural killer) si de imunitatea umorala, asiguratade limfocitele B, dar care are un rol limitat in controlarea infectiilor virale. Insa, in cazul unui organism cu imunitate scazuta - cazul pacientilor care urmeza chimioterapie, tratamente cu cortizoni, al celor cu diabet, ciroza, insuficienta renala si cu obezitate, toate virusurile pot deveni agresive.

Virusurile sufera mutatii

Virusurile au capacitate mutagena si, prin urmare, un virus mai putin agresiv se poate transforma, in timp, intr-unul extrem de activ si de periculos


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