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Table 1 The numbers of host birds examined and infected by Philophthalmus spp. during the study period and intensity of infection

From: Recent large-scale philophthalmosis outbreak in Portugal: inefficacy of common antihelminthic agents

Year

Host species

Larus michahellis

Larus fuscus

Total n examined

Infected birds, n (%)

Intensity of infectiona

Total n examined

Infected birds, n (%)

Intensity of infectiona

2015

205

1 (0.5%)

2

126

8 (6.3%)

3.5 (1– >50)

2016

341

7 (2.1%)

2 (1–16)

199

18 (9.0%)

11.5 (1–76)

2017

396

6 (1.5%)

6 (1–50)

185

19 (10.3%)

6 (1- >50)

2018

339

1 (0.3%)

5

160

7 (4.4%)

4 (3–18)

2019

802

10 (1.2%)

3 (1–51)

322

11 (3.4%)

3 (2–15)

2020

823

15 (1.8%)

4 (1–  >50)

397

16 (4.0%)

4 (1– >50)

  1. aMedian number of eye-flukes per host bird, with the range given in parentheses