Respiratory viruses crossing the species barrier and emergence of new human coronavirus infectious disease

by Nikolay Kalvatchev, Ivo Sirakov
Published 2021-01-01

Seroprevalence of Crimean-Congo Hemorrhagic Fever Virus, Bulgaria

by Iva Christova, Teodora Gladnishka, Evgenia Taseva, Nikolay Kalvatchev, Katerina Tsergouli, Anna Papa
Published 2013-01-01

Clostridioides (Clostridium) difficile carriage in asymptomatic children since 2010: a narrative review

by Lyudmila Boyanova, Nikolay Kalvatchev, Daniel Yordanov, Petyo Hadzhiyski, Rumyana Markovska, Galina Gergova, Ivan Mitov
Published 2019-01-01

Crimean-Congo Hemorrhagic Fever, Southwestern Bulgaria

by Iva Christova, Antonino Di Caro, Anna Papa, Concetta Castilletti, Lubena Andonova, Nikolay Kalvatchev, Evangelia Papadimitriou, Fabrizio Carletti, Emad Mohareb, Maria R. Capobianchi, Giuseppe Ippolito, Istituto Superiore di Sanità
Published 2009-06-01