A 23-year-old man complains about face edemata, headache, dizziness, reduced urination, change of urine colour (dark-red). These presentations appeared after pharyngitis. Objectively: face edemata, pale skin, temperature -37,4°C; heart rate - 86/min, AP - 170/110 mm Hg. Heart sounds are muffled, the II sound is accentuated above aorta. What etiological factor is probable in this case?