naked virus, nonenveloped virus a virus lacking an outer lipoprotein bilayer. neurotropic virus one that has a predilection for and causes infection in nervous tissues, e.g., the rabies virus. Norwalk virus a calicivirus that is a common agent of epidemics of acute gastroenteritis. oncogenic viruses an epidemiologic class of viruses that are acquired by close contact or injection and cause usually persistent infection; they may induce cell transformation and malignancy.
Define stumbling block: an obstacle to progress; an impediment to belief or understanding : perplexity â stumbling block in a sentence an obstacle to progress; an impediment to belief or understanding : perplexityâ¦
In football, a down block means a block in the direction of the offensive center. The basic idea in down blocking is the blocker engages with and blocks the first player to come across his face. So if the OL / DL alignment is like this, a down block play on sweep to the right side (outside the RT) goes like this... RT RG C LG LT TE. LDE LDT RDT RDE.