Abstract: The method of the invention relates to a method of typing one or more nucleic acid molecules, said method comprising: simultaneously or sequentially performing two or more primer extension reactions, each primer binding at a different predetermined site in said nucleic acid molecule(s), and determining the pattern of nucleotide incorporation to obtain a test pattern for said nucleic acid molecule(s) which is optionally compared with one or more reference patterns to type the said nucleic acid molecule(s).