Complex sentence: Human epithelial and endothelial cells, primary fibroblasts, and monocyte-derived macrophages are permissive for chikungunya virus "in vitro", and viral replication is highly cytopathic, but susceptible to type-I and-II interferon.
Split into simpler sentences: Human epithelial and endothelial cells, primary fibroblasts, and monocyte-derived macrophages are permissive for chikungunya virus "in vitro". Viral replication is highly cytopathic, but susceptible to type-I and-II interferon.