Tables
Tables should have a concise title and, if necessary, a footnote. A single grid is preferred for each table. If grids are not used, tabs and not spaces should be used to align columns. The preferred format for tables is MS Word.

Figures
Figures should be sized to fit in the column(s) of the Journal and should be submitted at their intended publication size. They are provided as PDF files only when submitted for reviewing to minimize file size. When the paper is accepted, quality digital files must be provided. The minimal resolution should be 300 dpi. TIFF or PowerPoint formats are preferred. In some cases a printed copy of the figures may be requested. To avoid font problems, a single font should be used throughout. Fonts as Arial, Helvetica, Symbol, Times New Roman are preferred.

Photographs
Photographs should be well contrasted, with non essential areas removed. For micrographs, a magnification bar must be included. There is a charge for colour photographs. Please contact the Editorial Office for rates.

Line drawings
These should be submitted as high-quality computer-generated figures. However, in some cases a printed copy of the figures may be requested. Symbols and line thickness should be clear. Shading should be avoided, as it may be difficult to reproduce.

Figure legends
These should give enough information to make the figure understandable and should be concise and self-explanatory. Detailed experimental procedures must be described in the Materials and Methods section and not in a legend. All symbols reported in the figure must be defined, together with abbreviations not reported in the text.

Sequence data
Manuscripts containing sequence data should include the relative accession number from a recognized nucleotide database. Diagrams of nucleotide and amino acid sequences should fit in the column(s) of the Journal. Characters should be 6-8 points.

Virus nomenclature
Virus names should be given accordingly to the standard rules set by the International Committee on Taxonomy of Viruses. Names of established species, genera, families and orders must be written in italics with capital initials. Tentative and unassigned species are written in roman type with capital initial.