<p><br /> As messages of support pour in for Cheryl Cole, her worried mother is said to be constantly by her bedside.<br /> </p><p><br /> 50-year-old Joan Callaghan was pictured looking downcast yesterday as she visited her daughter.<br /> </p><p><br /> Cheryl is battling malaria, after catching the potentially fatal disease it is thought while on holiday in Tanzania.<br /> </p><p><br /> She is being treated at University College London, which is home to the Hospital for Tropical Diseases, in the centre of the capital.<br /> </p><p><br /> JLS, Nadine Coyle and Sinitta are amongst Cheryl's star pals who have tweeted messages wishing her well.<br /> </p>
