Table 3 Summary of previous rickettsial infection cases, Ontario, Canada (2013–2018)
Variable | Spotted fever group rickettsiae | Typhus group rickettsiae | Unspecified Rickettsia infection |
|---|---|---|---|
Total cases, n | 183 | 89 | 308 |
Female, n (%) | 93 (50.8) | 47 (52.8) | 157 (50.9) |
Age, mean ± SE (range) | 41.3 ± 1.37 (3–87) | 44.9 ± 2.11 (2–85) | 43.8 ± 1.08 (< 1–89) |
IFA IgG titer, n | |||
1:64 | 154 | 75 | n/a |
1:128 | 22 | 6 | n/a |
1:256 | 7 | 8 | n/a |
IFA SFGR/TGR IgG titers (URI) | |||
1:64/1:64 | n/a | n/a | 154 |
1:64/1:128 | n/a | n/a | 9 |
1:64/1:256 | n/a | n/a | 1 |
1:128/1:64 | n/a | n/a | 42 |
1:128/1:128 | n/a | n/a | 50 |
1:128/1:256 | n/a | n/a | 8 |
1:256/1:64 | n/a | n/a | 6 |
1:256/1:128 | n/a | n/a | 12 |
1:256/1:256 | n/a | n/a | 25 |
1:512/1:512 | n/a | n/a | 1 |
Year of onset, n | |||
2013 | 9 | 12 | 19 |
2014 | 6 | 19 | 22 |
2015 | 10 | 20 | 33 |
2016 | 12 | 20 | 36 |
2017 | 45 | 14 | 92 |
2018 | 101 | 4 | 106 |
Signs and symptoms, n (%)a | |||
None reported | 123 (65.1) | 65 (73.0) | 199 (64.6) |
Headache | 30 (46.2) | 5 (20.8) | 53 (39.8) |
Fatigue | 19 (29.2) | 4 (16.7) | 33 (24.8) |
Arthralgia/arthritis | 8 (12.3) | 1 (4.2) | 7 (5.3) |
Fever | 7 (10.8) | 6 (25.0) | 16 (12.0) |
Gastrointestinal complaints | 6 (9.2) | 2 (8.3) | 5 (3.8) |
Tick bite | 4 (6.2) | 1 (4.2) | 5 (3.8) |
Rash (not described) | 2 (3.1) | 1 (4.2) | 6 (4.5) |
Respiratory complaints | 1 (1.5) | 5 (20.8) | 8 (6.0) |
Elevated liver enzymes | 1 (1.5) | 0 (0.0) | 0 (0.0) |
Dizziness | 1 (1.5) | 0 (0.0) | 0 (0.0) |
Anemia | 1 (1.5) | 0 (0.0) | 0 (0.0) |
Anxiety | 1 (1.5) | 0 (0.0) | 0 (0.0) |
Encephalitis/meningitis | 1 (1.5) | 2 (8.3) | 2 (1.5) |
Myalgia/body aches | 1 (1.5) | 0 (0.0) | 3 (2.3) |
Rash (vesicular) | 1 (1.5) | 1 (4.2) | 2 (1.5) |
Rash (maculopapular) | 1 (1.5) | 3 (12.5) | 2 (1.5) |
Jaundice | 1 (1.5) | 0 (0.0) | 1 (0.8) |
Malaise/unwell | 0 (0.0) | 0 (0.0) | 4 (3.0) |
Chills | 0 (0.0) | 0 (0.0) | 1 (0.8) |