Please see below for the latest update on Merced, Stanislaus, and Yolo County wastewater data.

  • Weeks 81-82: 05/07 - 05/20
  • Weeks 83-84: 05/21 - 06/03

Table 1: Variant to N-Gene Proportions (Week 84)

Last Week’s Variant to N-Gene Proportions
Site XBB HV 69 70
Davis 67% ( 48-100) 1% (0-2)
Esparto 70% ( 70- 70) 0% (0-0)
Los Banos 86% ( 80- 95) 0% (0-0)
Merced 73% ( 57- 98) 0% (0-0)
Modesto 100% (100-100) 0% (0-0)
Turlock 64% ( 52- 75) 0% (0-0)
Winters 100% (100-100) 0% (0-0)
Woodland 70% ( 51-100) 0% (0-0)
* Average (min-max)

General Update

Table 2: Percentage of change

Percent change
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 63% 40% +33% +8% 9% +972% 43% 47%
Influenza A +LL ND ND ND ND ND ND +LL
Influenza B +LL ND ND ND ND ND ND ND
RSV +LL ND ND ND ND ND ND ND
HMPV 73% 79% ND 62% +39% ND ND ND
Norovirus 19% 25% 39% 65% 22% 67% +384% 50%
Weeks: 81-82: 05/07 - 05/20
Weeks: 83-84: 05/21 - 06/03
Percent change is calculated here using average of measurements over the past two weeks compared to the average of measurements from the prior two weeks.
ND- Non-detect (below detection limit)
+LL increasing but at low levels

Table 3: Current wastewater level

Current wastewater level
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 Low Low Medium Low Low Medium Low Medium
Influenza A Medium Low Low Low Low Low Low Medium
Influenza B High Low Low Low Low Low Low Low
RSV Low Low Low Low Low Low Low Low
HMPV Low Low Low Low Medium Low Low Low
Norovirus Medium Medium Medium Low Low Low High Medium
The current wastewater levels are estimated using the 10-day rolling average (10-dma). The 33rd and 66th percentiles are calculated over the past 365 days before 14 days ago. For cities with less than 365 days, all days before 14 days ago are used. The current wastewater level is classified as:
• Low: The current 10-dma is below 33rd percentile
• Medium: The current 10-dma is between the 33rd and 66th percentile
• High: The current 10-dma is above 66th Percentile

Trend test for SARS-CoV-2

Table 4: Relative Strength Index

The Relative Strength Index
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 Downward No Trend No Trend No Trend No Trend Very likely upward No Trend Downward
Influenza A Very likely upward No Data No Data No Data No Data No Data No Data Upward
Influenza B Likely upward No Data No Data No Data No Data No Trend No Data No Data
RSV Very likely upward No Data No Data No Trend No Trend No Data No Data No Data
HMPV Downward Downward No Data No Trend No Trend No Data Downward Likely downward
Norovirus No Trend No Trend Downward No Trend No Trend No Trend Likely upward Downward
Week 84: 05/14 - 05/20
* The Relative Strength Index (RSI) calculates a ratio of the recent upward price movements to the absolute price movement. Developed by J. Welles Wilder.

Table 5: Percent change (PC)

Percent change in the last 14 days
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 No Trend Very likely downward Upward Very likely upward No Trend Very likely upward Very likely downward No Trend
Influenza A Upward No Trend No Trend No Trend No Trend No Trend No Trend Very likely upward
Influenza B Upward No Trend No Trend No Trend No Trend Very likely downward No Trend No Trend
RSV Upward No Trend No Trend Very likely downward Very likely downward No Trend No Trend No Trend
HMPV No Trend Likely upward No Trend No Trend Very likely upward No Trend Downward No Trend
Norovirus Very likely upward Very likely downward Very likely downward Very likely downward Upward Very likely downward Very likely upward Very likely downward
Week 84: 05/14 - 05/20
* The slope is calculated from a least-squares linear regression of log10-transformed values of the N/PMMoV data versus day. We used a 14-day look-back period to calculate the slope. For each slope estimate, we extracted the 90%, 95%, and 99% confidence intervals (CIs) to calculate the 90%, 95%, and 99% CIs for each PC estimate. We interpreted PC values greater than 0 for the 90%, 95%, and 99% upper CIs as upward, likely upward, and very likely upward trends, respectively. We interpreted PC values less than 0 for the 90%, 95%, and 99% lower CIs as downward, likely downward, and very likely downward trends day and previous n - 1 days.

Table 6: Mann-Kendall trend test

Mann-Kendall trend test
Virus Merced County Stanislaus County Yolo County
Merced Los Banos Modesto Turlock Davis Esparto Winters Woodland
SARS-CoV-2 Likely upward Very likely downward No Trend Very likely upward No Trend Very likely upward Likely downward No Trend
Influenza A Likely upward No Data No Data No Data No Data No Data No Data Very likely upward
Influenza B Very likely upward No Data No Data No Data No Data Very likely downward No Data No Data
RSV Likely upward No Data No Data Very likely downward Very likely downward No Data No Data No Data
HMPV No Trend No Trend No Data No Trend Likely upward No Data Very likely downward No Data
Norovirus Likely upward Very likely downward Very likely downward Very likely downward No Trend Very likely downward Very likely upward Very likely downward
Week 84: 05/14 - 05/20
* The Mann-Kendall (MK) trend test is a nonparametric test that evaluates whether there is a monotonic trend in a time-series dataset. We applied the MK trend test to raw N/PMMoV data and used a 14-day lookback period. We interpreted positive values of the test statistic, tau (τ), with p ≤ 0.1, p ≤ 0.05, and p ≤ 0.01 as upward, likely upward, and very likely upward trends, respectively. We interpreted negative τ values with p ≤ 0.1, p ≤ 0.05, and p ≤ 0.01 as downward, likely downward, and very likely downward trends, respectively.

Merced County

SARS-CoV-2

Merced’s average SARS-CoV-2 concentrations (N/PMMoV) decreased ⬇️ by 63% between the most recent two weeks and the two weeks prior to that. Los Banos’ average decreased ⬇️ by 40%.

Fig 1. Merced

Fig 2. Los Banos

Influenza A

Merced’s average Influenza A concentrations (Flu A/PMMoV) increased ⬆️ by 100% between the most recent two weeks and the two weeks prior to that. Los Banos’ average showed no detection.

Influenza B

Merced’s average Influenza B concentrations (Flu B/PMMoV) increased ⬆️ by 100% between the most recent two weeks and the two weeks prior to that. Los Banos’ average showed no detection.

RSV

Merced’s average RSV concentrations (RSV/PMMoV) increased ⬆️ by 100% between the most recent two weeks and the two weeks prior to that. Los Banos’ average showed no detection.

HMPV

Merced’s HMPV concentrations (HMPV/PMMoV) decreased ⬇️ by 73% between the most recent two weeks and the two weeks prior to that. Los Banos’s average decreased ⬇️ by 79%.

Norovirus

Merced’s average Norovirus concentrations (Norovirus/PMMoV) decreased ⬇️ by 19% between the most recent two weeks and the two weeks prior to that. Los Banos’ average decreased ⬇️ by 25%.

Fig. Merced

Fig. Los Banos

Stanislaus County

SARS-CoV-2

Modesto’s average SARS-CoV-2 concentrations (N/PMMoV) increased ⬆️ by 33% between the most recent two weeks and the two weeks prior to that. Turlock’s average increased ⬆️ by 8%.

Fig 1. Modesto

Fig 2. Turlock

Influenza A

Modesto’s average Influenza A concentrations (Flu A/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Turlock’s average showed no detection.

Influenza B

Modesto’s average Influenza B concentrations (Flu B/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Turlock’s average showed no detection.

RSV

Modesto’s average RSV concentrations (RSV/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Turlock’s average showed no detection.

HMPV

Modesto’s average HMPV concentrations (HMPV/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Turlock’s average decreased ⬇️ by 62%.

Norovirus

Modesto’s average Norovirus concentrations (Norovirus/PMMoV) decreased ⬇️ by 39% between the most recent two weeks and the two weeks prior to that. Turlock’s average decreased ⬇️ by 65%.

Fig. Modesto

Fig. Turlock

Yolo County

SARS-CoV-2

Davis’ average SARS-CoV-2 concentrations (N/PMMoV) decreased ⬇️ by 9% between the most recent two weeks and the two weeks prior to that. Esparto’s average increased ⬆️ by 972%. Winters’ average decreased ⬇️ by 43%. Woodland’s average decreased ⬇️ by 47%.

Fig 1. Davis

Fig 2. Esparto

Fig 3. Winters

Fig 4. Woodland

Influenza A

Davis’ average Influenza A concentrations (Flu A/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average increased ⬆️ by 100%.

Influenza B

Davis’ average Influenza B concentrations (Flu B/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average increased ⬆️ by 100%.

RSV

Davis’ average RSV concentrations (RSV/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average showed no detection.

HMPV

Davis’ HMPV concentrations (HMPV/PMMoV) increased ⬆️ by 39% between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average showed no detection.

Norovirus

Davis’ Norovirus concentrations (Norovirus/PMMoV) decreased ⬇️ by 22% between the most recent two weeks and the two weeks prior to that. Esparto’s average decreased ⬇️ by 67%. Winters’ average increased ⬆️ by 384%. Woodland’s average decreased ⬇️ by 50%.

Fig. Davis

Fig. Esparto

Fig. Winters

Fig. Woodland

All Counties

Mpox Update

There are no detections for samples taken at our plants from the last two weeks. https://healthycvtogether.org/monkeypox-data/

Influenza B

Davis’ average Influenza B concentrations (Flu B/PMMoV) showed no detection between the most recent two weeks and the two weeks prior to that. Esparto’s average showed no detection. Winters’ average showed no detection. Woodland’s average showed no detection. Merced’s average increased ⬆️ by 100%. Los Banos’ average showed no detection. Modesto’s average showed no detection. Turlock’s average showed no detection