Sentence:  Wound tumor virus is a leafhopper transmitted virus not easily transmissible by mechanical inoculation ( Black , 1944 ; Brakke <WSD>et</WSD> al. , 1954 ) . 
Meaning of the word marked with <WSD> tags:  and others ('et al.' is used as an abbreviation of `et alii' (masculine plural) or `et aliae' (feminine plural) or `et alia' (neuter plural) when referring to a number of people)