Table. Organisms (mean weekly count, by specimen collection week) with nonzero specimen counts in every week from 1991 to mid-2011, England and Wales.
| Organism name | Mean weekly count |
|---|---|
| Chlamydia trachomatis | 1,480 |
| Campylobacter spp. | 899 |
| Staphylococcus aureus | 764 |
| Clostridium difficile toxin detection | 313 |
| Rotavirus | 303 |
| Escherichia coli untyped | 267 |
| Staphylococcus coagulase negative | 167 |
| Streptococcus pneumoniae | 119 |
| Herpes simplex virus untyped | 102 |
| Herpes simplex virus type 2 | 100 |
| Pseudomonas aeruginosa | 96 |
| Herpes simplex virus type 1 | 92 |
| Cryptosporidium spp. | 86 |
| Giardia lamblia | 86 |
| Clostridium difficile not stated | 81 |
| Norovirus | 76 |
| Streptococcus group B | 57 |
| Mycobacterium tuberculosis | 54 |
| Enteroccoccus faecalis | 52 |
| Klebsiella pneumoniae | 50 |
| Streptococcus group A | 49 |
| Adenovirus untyped | 43 |
| Staphylococcus epidermidis | 36 |
| Proteus mirabilis | 35 |
| Enterobacter cloacae | 34 |
| Cytomegalovirus | 29 |
| Streptococcus group G | 26 |
| M. pneumoniae | 21 |
| Enterococcus faecium | 19 |
| Bacteroides fragilis | 14 |