J. V. Caicedo Loor, C. A. . Moyota Flores, V. del R. . Pilco Quishpe, and J. C. . Cañarte Vélez, “History and guideline of the serological profile anti SARS – CoV – 2 in Ecuador”, Pentaciencias, vol. 4, no. 6, pp. 370–378, Dec. 2022.