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No acute illness linked to seroconversion. One individual with serial samples showed seroconversion between spring and fall, without recall of illness. | Virus | Human fatality rate | Vector | IFN antagonism | MTLV similarity | |-------|--------------------|--------|----------------|------------------| | SFTSV | 12–30% | Haemaphysalis longicornis | Strong (NSs) | Genomic architecture | | Heartland virus | ~10% | A. americanum | Moderate | Vector, geography | | MTLV | 0% (no known cases) | A. americanum | Weak | M segment structure |