There are ways that this virus is different from other as you guys have pointed out. But we are also learning now about complex inter-virus and inter-antibody types of interactions that are very problematic. For example, a recent study by the US military intended to measure the cost effectiveness of administering flu vaccine to military personnel found that having received the flu vaccine makes you more susceptible to corona virus, and the infections tend to be worse. These inter-virus interference patterns can result in a vaccine to immunize you against one virus can end up making you more susceptible to other viruses. This can be one of the explanations why one area can have one type of curve, and another area a different curve. It could relate to some areas being flu vaccination heavy and some areas much less.
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