Never stuck for a theory, Mrs T offers the following:
Dear Mrs Samarkand, she writes, I can't believe you have another cold! According to Mrs Prytherch, my neighbour across, who is a Christian Scientist, all illnesses are punishments for sin. So I just wonder what you have been up to: lust, envy and pride, I shouldn't wonder, you being English and all.
As to a cure, maybe you need to try being good for a while, though in your case it might take a VERY long while, you being English and all.
Blodwen Trellis, Mrs, Widow, Retd
PS Sorry I got your name wrong before. I know you are not a teapot or a Siberian wolfhound, but it's a mistake anyone could make.