Most of what we read about in terms of 'new strains' is mostly about small genetic and sometimes amino acid (affecting the protein) changes, the impact of which is either unknown or not obvious. As far as we know, all SARS-CoV-2 variants react to antibodies raised against any of them and their sequences don't dramatically change the proteins they encode. It's like all of the world's human genetic diversity still sitting under the umbrella of one species. "For now, SARS-CoV-2 and its variants can still be considered as a single 'virus'. What do we know about COVID strains circulating across the world, including the D614G strain? "Not enough info to draw any firm conclusions yet." What do we know about the current strain in the Adelaide COVID-19 cluster? In the meantime, we need to be careful not to be overly speculative." We are still early in this cluster and need to gather more evidence. A superspreading event may also have occurred, with varying incubation periods among the infected, making the determination of the occurrence of infection harder to interpret. It may be that it has been difficult to accurately identify when one person was infected by another in a large family setting with many shared surfaces and airspaces providing lots of opportunities for transmission. "The authorities seem to be describing an incubation period of 24 hours. Is there evidence to support this claim and have such 'super-strains' been detected elsewhere in the world? SA health authorities claim they are fighting a particularly virulent strain of the virus with a shorter-than-usual incubation period and fewer symptoms. "Strains usually differ by a larger number of protein-affecting genetic mutations." What makes something a '”new strain” versus the small differences found in genomic testing? "Experts in the area prefer the term 'variants' - each is a virus from a different person, or group of people (forming a 'lineage' when their sequences are compared to other members of the same virus), which have undergone a small amount of discriminable genetic change during their infectious travels."
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