Science, Maths & Technology
COVID-19: Immunology, vaccines and epidemiology
...families of virus In addition to their obvious differences in size and shape, viruses are classified according to their genetic material and how it is replicated: DNA or RNA single-stranded (ss) or double stranded (ds) positive sense or negative sense; this relates to whether the genome directly encodes protein (positive) or whether it must be replicated before it can...